Human Anatomy and Physiology Exam — Questions and Answers

Question 1: Which muscle is the primary hip flexor?

Gluteus maximus
Sartorius
Tensor fasciae latae
Iliopsoas (Correct answer)

Correct answer: Iliopsoas

The iliopsoas, composed of the iliacus and psoas major, is the primary hip flexor.

Question 2: The interosseous talocalcaneal ligament is located in which anatomical space?

Plantar fascia
Sinus tarsi (Correct answer)
Anterior ankle recess
Tarsal tunnel

Correct answer: Sinus tarsi

The interosseous talocalcaneal ligament lies within the sinus tarsi (a canal between the talus and calcaneus), binding the two bones and limiting subtalar motion.

Question 3: Which feature distinguishes a myofibroblast from a fibroblast histologically?

Expression of alpha-smooth muscle actin (α-SMA) (Correct answer)
Large eccentric nucleus
Presence of lipid droplets
Abundant rough ER and Golgi

Correct answer: Expression of alpha-smooth muscle actin (α-SMA)

Myofibroblasts express α-smooth muscle actin, assembling stress fibers that give them contractile properties absent in typical fibroblasts.

Question 4: Proteoglycans contribute to tissue hydration primarily because glycosaminoglycan chains are:

Highly negatively charged and attract cations and water (Correct answer)
Degraded by hyaluronidase only
Covalently cross-linked to collagen
Hydrophobic and repel water

Correct answer: Highly negatively charged and attract cations and water

The high density of negative charges on GAG chains attracts cations and osmotically draws large amounts of water into the matrix.

Question 5: Which type of cartilage is found in the intervertebral discs?

Elastic cartilage
Fibrocartilage (Correct answer)
Hyaline cartilage
Calcified cartilage

Correct answer: Fibrocartilage

Fibrocartilage, which contains dense collagen fibers, is found in intervertebral discs and provides strength and shock absorption.

Question 6: In Marfan syndrome, the primary structural defect involves which connective tissue protein?

Elastin
Fibrillin-1 (Correct answer)
Type I collagen
Fibronectin

Correct answer: Fibrillin-1

Marfan syndrome results from mutations in the FBN1 gene encoding fibrillin-1, a major component of elastic fiber microfibrils.

Question 7: Chordae tendineae connect papillary muscles to which structures?

Semilunar valve cusps
Atrioventricular valve cusps (Correct answer)
Trabeculae carneae
Interventricular septum

Correct answer: Atrioventricular valve cusps

Chordae tendineae are tendon-like cords that connect papillary muscles to the cusps of the atrioventricular (mitral and tricuspid) valves, preventing valve prolapse.

Question 8: Wormian (sutural) bones are most commonly found near which suture?

Metopic suture
Squamous suture
Coronal suture
Lambdoid suture (Correct answer)

Correct answer: Lambdoid suture

Wormian bones are small, irregular accessory ossicles most frequently found within the lambdoid suture, though they can occur in any suture.

Question 9: What is the name of the valve between the right atrium and the right ventricle?

Tricuspid valve (Correct answer)
Aortic valve
Mitral valve
Pulmonary valve

Correct answer: Tricuspid valve

The tricuspid (right atrioventricular) valve has three cusps and controls blood flow from the right atrium to the right ventricle.

Question 10: Which structure prevents posterior displacement of the tibia relative to the femur?

Medial collateral ligament
Posterior cruciate ligament (Correct answer)
Anterior cruciate ligament
Arcuate ligament

Correct answer: Posterior cruciate ligament

The posterior cruciate ligament (PCL) is the primary restraint against posterior tibial translation, preventing the tibia from sliding backward under the femur.

Question 11: The renal hilum is located on which aspect of the kidney?

Lateral border
Medial border (Correct answer)
Posterior surface
Superior pole

Correct answer: Medial border

The renal hilum is a vertical slit on the medial border through which vessels, nerves, and the ureter pass.

Question 12: The celiac trunk is the primary arterial supply to the foregut. Which of its three main branches provides the main arterial supply to the lesser curvature of the stomach and the abdominal part of the esophagus?

Common hepatic artery
Left gastric artery (Correct answer)
Splenic artery
Gastroduodenal artery

Correct answer: Left gastric artery

The celiac trunk has three main branches: the left gastric, common hepatic, and splenic arteries. The left gastric artery courses along the lesser curvature of the stomach and gives off esophageal branches to supply the abdominal part of the esophagus. [9, 16]

Question 13: The infraspinatus muscle inserts onto which part of the greater tubercle of the humerus?

Lesser tubercle
Inferior facet
Middle facet (Correct answer)
Superior facet

Correct answer: Middle facet

The infraspinatus inserts onto the middle facet of the greater tubercle of the humerus.

Question 14: Which carpal bone is most commonly fractured?

Trapezium
Lunate
Scaphoid (Correct answer)
Hamate

Correct answer: Scaphoid

The scaphoid is the most commonly fractured carpal bone, typically due to a fall on an outstretched hand.

Question 15: Despite not serving as a structural link like bone or cartilage, why is blood still regarded as a connective tissue?

Blood serves the extracellular connector of bone and cartilage
Blood is made up of cells suspended in extracellular fluid (Correct answer)
Blood is a structural connector, much like bone or cartilage
All of your body's critical organs are connected by blood

Correct answer: Blood is made up of cells suspended in extracellular fluid

Connective tissues are characterized by having cells dispersed within an abundant extracellular matrix. While blood is fluid and doesn't provide structural support like bone, it fits this definition because its cells (red blood cells, white blood cells, platelets) are suspended in a liquid extracellular matrix called plasma. This composition allows blood to connect and transport substances throughout the body.

Question 16: The fibrous skeleton of the heart serves which primary function?

Supplying nutrients to the myocardium
Providing attachment points for valves and electrically insulating atria from ventricles (Correct answer)
Forming the outer protective layer of the heart
Generating the electrical impulse for contraction

Correct answer: Providing attachment points for valves and electrically insulating atria from ventricles

The fibrous skeleton anchors the four heart valves, provides attachment for myocardial fibers, and acts as an electrical insulator between atria and ventricles.

Question 17: Which structure guards the outlet of the stomach, regulating chyme entry into the duodenum?

Pyloric sphincter (Correct answer)
Sphincter of Oddi
Ileocecal valve
Lower esophageal sphincter

Correct answer: Pyloric sphincter

The pyloric sphincter is a thickening of circular smooth muscle at the gastroduodenal junction that controls the rate of gastric emptying.

Question 18: Which functional fiber type is carried exclusively by CN II (Optic nerve)?

Special somatic afferent (SSA) (Correct answer)
Special visceral afferent (SVA)
General somatic afferent (GSA)
General visceral afferent (GVA)

Correct answer: Special somatic afferent (SSA)

The optic nerve carries only special somatic afferent (SSA) fibers conveying vision from the retina.

Question 19: Which connective tissue type is found in the stroma of the liver and spleen?

Dense regular
Reticular (Correct answer)
Loose areolar
Dense irregular

Correct answer: Reticular

Reticular connective tissue forms the supporting stroma of lymphoid organs and parenchymal organs such as the liver and spleen.

Question 20: Which of the following best sums up how cells breathe?

It is an oxidative catabolic activity (Correct answer)
It is an oxidative anabolic activity
It is a reductive anabolic activity
It is a reductive catabolic activity

Correct answer: It is an oxidative catabolic activity

Cellular respiration, often described as how cells 'breathe,' is fundamentally an oxidative catabolic activity. It involves the breakdown of complex organic molecules (catabolism) to release energy, primarily in the form of ATP. This process requires oxygen (oxidative) as the final electron acceptor, leading to the production of carbon dioxide and water.

Question 21: The thoracodorsal nerve innervates the latissimus dorsi and arises from which cord?

Lateral cord
Upper trunk
Medial cord
Posterior cord (Correct answer)

Correct answer: Posterior cord

The thoracodorsal nerve is a branch of the posterior cord (C6–C8) and innervates the latissimus dorsi.

Question 22: Which resident cell of connective tissue proper is responsible for synthesizing the protein fibers and amorphous ground substance of the extracellular matrix?

Fibroblast (Correct answer)
Macrophage
Mast cell
Adipocyte

Correct answer: Fibroblast

The fibroblast is the principal cell of connective tissue proper. Its primary function is to produce and maintain the extracellular matrix by secreting its components, including collagen, elastic, and reticular fibers, as well as the glycosaminoglycans and proteoglycans of the ground substance.

Question 23: Which cranial nerve is responsible for the efferent limb of the gag reflex?

CN IX (Glossopharyngeal)
CN X (Vagus) (Correct answer)
CN VII (Facial)
CN XII (Hypoglossal)

Correct answer: CN X (Vagus)

The vagus nerve (CN X) provides the motor (efferent) response of the gag reflex by elevating the palate and constricting the pharynx; CN IX is the afferent limb.

Question 24: Which ligament connects the lesser curvature of the stomach to the liver?

Hepatoduodenal ligament
Hepatogastric ligament (Correct answer)
Gastrosplenic ligament
Gastrorenal ligament

Correct answer: Hepatogastric ligament

The hepatogastric ligament is the portion of the lesser omentum that stretches from the porta hepatis to the lesser curvature of the stomach.

Question 25: The trochlear nerve (CN IV) is unique among cranial nerves because it:

Passes through the foramen rotundum
Exits from the dorsal brainstem and crosses before exiting (Correct answer)
Has the largest diameter of all cranial nerves
Is purely sensory

Correct answer: Exits from the dorsal brainstem and crosses before exiting

CN IV is the only cranial nerve to exit from the dorsal surface of the brainstem and decussates before emerging, making it the longest intracranial cranial nerve.

Question 26: The oblique popliteal ligament at the knee is an expansion of which tendon?

Biceps femoris
Semimembranosus (Correct answer)
Semitendinosus
Popliteus

Correct answer: Semimembranosus

The oblique popliteal ligament is a reflection of the semimembranosus tendon that reinforces the posterior knee capsule.

Question 27: What is the proper ranking of structures, from the simplest to the most complex?

Mitochondria, neurons, nerve tissues, brain (Correct answer)
Neurons, mitochondria, nerve tissues, brain
Brain, neurons, mitochondria, nerve tissues
Mitochondria, nerve tissues, neurons, brain

Correct answer: Mitochondria, neurons, nerve tissues, brain

The biological hierarchy of organization progresses from simpler to more complex structures. Mitochondria are organelles within cells, neurons are individual cells, nerve tissues are groups of similar cells working together, and the brain is an organ composed of various tissues. Thus, the correct order from simplest to most complex is mitochondria, neurons, nerve tissues, and brain.

Question 28: Which muscle flexes the thigh at the hip and extends the leg at the knee?

Gluteus maximus
Rectus femoris (Correct answer)
Adductor magnus
Hamstrings

Correct answer: Rectus femoris

Rectus femoris is the only quadriceps muscle that crosses the hip joint, allowing it to flex the thigh while also extending the knee.

Question 29: Which artery is most commonly blocked in an anterior wall myocardial infarction?

Obtuse marginal artery
Left circumflex artery
Left anterior descending artery (Correct answer)
Right coronary artery

Correct answer: Left anterior descending artery

The left anterior descending (LAD) artery supplies the anterior wall of the left ventricle and is most often occluded in anterior MI, earning it the nickname 'widow maker.'

Question 30: Which muscle performs eversion of the foot?

Tibialis anterior
Flexor hallucis longus
Peroneus (fibularis) brevis (Correct answer)
Tibialis posterior

Correct answer: Peroneus (fibularis) brevis

The peroneus brevis, along with peroneus longus, is a primary evertor of the foot.

Question 31: The axial skeleton consists of which bones?

Limb bones and pectoral girdle
Upper limbs and shoulder girdle
Pelvic girdle and lower limbs
Skull, vertebral column, and thoracic cage (Correct answer)

Correct answer: Skull, vertebral column, and thoracic cage

The axial skeleton forms the central axis of the body and consists of the skull, vertebral column (spine), and thoracic cage (ribs and sternum).

Question 32: Which layer of the esophageal wall is responsible for peristaltic contractions in the upper third?

Cardiac muscle
Skeletal muscle (Correct answer)
Smooth muscle
Elastic fibers

Correct answer: Skeletal muscle

The upper third of the esophagus contains skeletal muscle that enables voluntary initiation of swallowing.

Question 33: The hip joint's blood supply to the femoral head is primarily from which vessel?

Lateral circumflex femoral artery
Profunda femoris artery
Superior gluteal artery
Medial circumflex femoral artery (Correct answer)

Correct answer: Medial circumflex femoral artery

The medial circumflex femoral artery provides the dominant blood supply to the femoral head via retinacular vessels running along the femoral neck.

Question 34: Which sinus of the pericardium lies behind the left atrium between the pulmonary veins?

Oblique sinus (Correct answer)
Anterior sinus
Coronary sinus
Transverse sinus

Correct answer: Oblique sinus

The oblique sinus of the pericardium is a cul-de-sac posterior to the left atrium, bordered by the pulmonary veins and inferior vena cava reflections.

Question 35: Which groove on the inner surface of the occipital bone lodges the transverse sinus?

Cavernous sinus groove
Transverse sulcus (Correct answer)
Occipital sulcus
Sigmoid sulcus

Correct answer: Transverse sulcus

The transverse sulcus is the horizontal groove on the inner surface of the occipital bone that houses the transverse venous sinus.

Question 36: What is the name of the peritoneal recess posterior to the stomach?

Paracolic gutter
Hepatorenal recess
Rectouterine pouch
Omental bursa (lesser sac) (Correct answer)

Correct answer: Omental bursa (lesser sac)

The omental bursa (lesser sac) is the potential space posterior to the stomach and lesser omentum, communicating with the greater sac through the epiploic foramen.

Question 37: Which portion of the interventricular septum is primarily membranous (fibrous) rather than muscular?

The apical portion
The large inferior portion
The middle third
The small superior portion near the fibrous skeleton (Correct answer)

Correct answer: The small superior portion near the fibrous skeleton

The membranous part of the interventricular septum is a small, thin fibrous area located superiorly near the fibrous skeleton; the remaining majority is thick muscular septum.

Question 38: The soleus muscle differs from the gastrocnemius in that it:

Is innervated by the deep peroneal nerve
Originates from the femur
Crosses the knee joint
Does not cross the knee joint (Correct answer)

Correct answer: Does not cross the knee joint

Unlike the gastrocnemius, the soleus originates from the tibia and fibula and does not cross the knee joint.

Question 39: A full-thickness tear of the supraspinatus tendon would most likely result in weakness of which movement?

Internal rotation
Horizontal adduction
Arm adduction
Arm abduction (Correct answer)

Correct answer: Arm abduction

The supraspinatus is critical for initiating and maintaining arm abduction, so a full-thickness tear weakens this movement.

Question 40: Which meningeal branch primarily supplies the dura overlying the parietal bone?

Middle meningeal artery (Correct answer)
Accessory meningeal artery
Anterior meningeal artery
Posterior meningeal artery

Correct answer: Middle meningeal artery

The middle meningeal artery, a branch of the maxillary artery, is the primary blood supply to the dura mater overlying the parietal and temporal regions.

Question 41: A patient with a lesion at the internal acoustic meatus would most likely present with deficits in which cranial nerves?

CN V and VI
CN IX and X
CN VII and VIII (Correct answer)
CN III and IV

Correct answer: CN VII and VIII

The internal acoustic meatus (internal auditory canal) transmits CN VII (facial) and CN VIII (vestibulocochlear), along with the labyrinthine artery.

Question 42: A newborn is diagnosed with Erb's palsy following a difficult delivery. This condition, characterized by a 'waiter's tip' posture, involves damage to which part of the brachial plexus?

The lower trunk (C8, T1)
The medial cord
The superior trunk (C5, C6) (Correct answer)
The posterior cord

Correct answer: The superior trunk (C5, C6)

Erb's palsy, or Erb-Duchenne palsy, is an injury to the upper parts of the brachial plexus, specifically the superior trunk, which is formed by the union of the C5 and C6 nerve roots. [4, 8, 15] This injury affects muscles innervated by these roots, leading to the characteristic adducted, internally rotated arm with a pronated forearm, known as the 'waiter's tip' hand. [1]

Question 43: The Circle of Willis receives blood from how many major arteries?

Four
Two
Five
Three (Correct answer)

Correct answer: Three

The Circle of Willis is supplied by three arteries: two internal carotid arteries and one basilar artery.

Question 44: The sartorius muscle is innervated by which nerve?

Sciatic nerve
Superior gluteal nerve
Obturator nerve
Femoral nerve (Correct answer)

Correct answer: Femoral nerve

The sartorius is innervated by the femoral nerve (L2, L3).

Question 45: The subscapularis muscle passes anterior to the shoulder joint and inserts on which structure?

Lesser tubercle of the humerus (Correct answer)
Surgical neck of the humerus
Greater tubercle of the humerus
Bicipital groove

Correct answer: Lesser tubercle of the humerus

The subscapularis inserts onto the lesser tubercle of the humerus, which is on the anterior aspect of the proximal humerus.

Question 46: Which type of ossification produces the bones of the cranial vault?

Periosteal ossification
Enchondral ossification
Endochondral ossification
Intramembranous ossification (Correct answer)

Correct answer: Intramembranous ossification

The flat bones of the cranial vault form by intramembranous ossification, where bone develops directly within a connective tissue membrane without a cartilage precursor.

Question 47: Teres minor originates from which structure?

Infraspinous fossa
Subscapular fossa
Upper two-thirds of the lateral border of the scapula (Correct answer)
Supraspinous fossa

Correct answer: Upper two-thirds of the lateral border of the scapula

The teres minor originates from the upper two-thirds of the lateral (axillary) border of the scapula.

Question 48: Which cranial nerve foramen is found in the middle cranial fossa and transmits the middle meningeal artery?

Foramen lacerum
Foramen rotundum
Foramen ovale
Foramen spinosum (Correct answer)

Correct answer: Foramen spinosum

The foramen spinosum transmits the middle meningeal artery (and vein), which runs in grooves on the inner surface of the temporal bone; rupture causes epidural hematoma.

Question 49: Which of the following structures are best described as inward extensions of cortical tissue that separate the renal pyramids within the medulla?

Major calyces
Renal papillae
Renal columns of Bertin (Correct answer)
Medullary rays

Correct answer: Renal columns of Bertin

The renal columns (of Bertin) are extensions of the renal cortex that project down into the medulla, located in the spaces between the renal pyramids. They are composed of the same tissue as the cortex and provide a supportive framework and a route for blood vessels.

Question 50: The nerve to the subclavius arises from which part of the brachial plexus?

Lateral cord
C6 root directly
Posterior cord
Upper trunk (Correct answer)

Correct answer: Upper trunk

The nerve to subclavius (C5–C6) branches from the upper trunk of the brachial plexus.

Question 51: A patient is diagnosed with a peptic ulcer in the first part of the duodenum (duodenal bulb). This region is unique because, unlike the other three parts of the duodenum, it is:

The site where the common bile duct enters
Intraperitoneal (Correct answer)
Characterized by the presence of Brunner's glands
Primarily supplied by the inferior mesenteric artery

Correct answer: Intraperitoneal

The first part of the duodenum, specifically the proximal 2.5 cm known as the duodenal bulb or cap, is intraperitoneal, meaning it is covered by peritoneum. The remaining parts (descending, horizontal, and ascending) are retroperitoneal. [8]

Question 52: The deltoid ligament of the ankle resists which force?

Eversion of the foot (Correct answer)
Dorsiflexion
Plantarflexion
Inversion of the foot

Correct answer: Eversion of the foot

The strong deltoid (medial collateral) ligament on the medial side of the ankle is the primary restraint against eversion, making isolated deltoid tears uncommon.

Question 53: Which structure forms the acetabular labrum's primary function in the hip joint?

Provides arterial supply to the femoral head
Transmits weight from pelvis to femur
Deepens the socket and improves stability (Correct answer)
Acts as the primary restraint against hip flexion

Correct answer: Deepens the socket and improves stability

The acetabular labrum deepens the acetabular socket, increasing joint congruency and stability while also creating a negative pressure seal.

Question 54: Preganglionic parasympathetic fibers for lacrimal and nasal gland secretion travel in which cranial nerve?

CN IX (Glossopharyngeal)
CN X (Vagus)
CN V1 (Ophthalmic)
CN VII (Facial) (Correct answer)

Correct answer: CN VII (Facial)

CN VII carries preganglionic parasympathetic fibers via the greater petrosal nerve to the pterygopalatine ganglion, which relays postganglionic fibers to the lacrimal and nasal glands.

Question 55: Which muscle is the primary plantarflexor of the foot?

Peroneus longus
Tibialis anterior
Extensor digitorum longus
Gastrocnemius (Correct answer)

Correct answer: Gastrocnemius

The gastrocnemius, together with the soleus, is the primary plantarflexor of the foot.

Question 56: Which surface of the heart rests on the diaphragm?

Posterior (base) surface
Inferior (diaphragmatic) surface (Correct answer)
Anterior (sternocostal) surface
Left pulmonary surface

Correct answer: Inferior (diaphragmatic) surface

The inferior (diaphragmatic) surface of the heart, formed mainly by the left ventricle, rests on the diaphragm.

Question 57: Which component of the basement membrane forms a self-assembling polygonal lattice?

Perlecan
Type IV collagen (Correct answer)
Fibronectin
Laminin

Correct answer: Type IV collagen

Type IV collagen molecules self-assemble into a polygonal lattice network that forms the structural scaffold of all basement membranes.

Question 58: At the knee, which structure provides the primary static restraint against valgus (lateral) stress?

Lateral collateral ligament
Anterior cruciate ligament
Iliotibial tract
Medial collateral ligament (Correct answer)

Correct answer: Medial collateral ligament

The medial collateral ligament is the primary static stabilizer resisting valgus stress (force pushing the knee inward), tested with the valgus stress test.

Question 59: Which structure lies immediately anterior to the left kidney?

Stomach (Correct answer)
Ascending colon
Duodenum
Liver

Correct answer: Stomach

The stomach lies directly anterior to the upper portion of the left kidney.

Question 60: The spring ligament (plantar calcaneonavicular ligament) primarily supports which structure?

Cuboid bone
Head of the talus (Correct answer)
Sustentaculum tali
Base of the fifth metatarsal

Correct answer: Head of the talus

The spring ligament supports the head of the talus from below, helping maintain the medial longitudinal arch; its insufficiency contributes to flatfoot deformity.

Question 61: Which cranial nerve passes through the cavernous sinus but does NOT travel within the sinus wall (it runs freely within the sinus)?

CN III (Oculomotor)
CN VI (Abducens) (Correct answer)
CN IV (Trochlear)
CN V1 (Ophthalmic)

Correct answer: CN VI (Abducens)

CN VI passes freely within the cavernous sinus, making it most vulnerable to increased intrasinus pressure; CN III, IV, V1, and V2 travel in the lateral wall.

Question 62: What type of epithelium lines the renal pelvis?

Transitional (urothelium) (Correct answer)
Simple squamous
Pseudostratified columnar
Simple columnar

Correct answer: Transitional (urothelium)

The renal pelvis, like the ureter and bladder, is lined by transitional epithelium (urothelium) capable of stretching.

Question 63: Which rotator cuff muscle has the largest cross-sectional area and is therefore the most powerful?

Supraspinatus
Subscapularis (Correct answer)
Teres minor
Infraspinatus

Correct answer: Subscapularis

The subscapularis has the largest cross-sectional area of the rotator cuff muscles, making it the most powerful internal rotator.

Question 64: Which chamber of the heart has the thickest wall and why?

Right ventricle, because it pumps blood to the lungs
Right atrium, because it receives all systemic venous blood
Left ventricle, because it pumps blood against high systemic resistance (Correct answer)
Left atrium, because it receives oxygenated blood from the lungs

Correct answer: Left ventricle, because it pumps blood against high systemic resistance

The left ventricle has the thickest wall (~11–14 mm) because it must generate sufficient pressure to pump blood through the entire systemic circulation.

Question 65: A pathologist examining a biopsy from a torn Achilles tendon would primarily observe which histological feature?

Densely packed, parallel bundles of type I collagen fibers with flattened fibroblasts (Correct answer)
A meshwork of fine, branching reticular fibers supporting lymphocytes
Chondrocytes situated within lacunae in a glassy matrix
A loose arrangement of collagen and elastic fibers with abundant ground substance

Correct answer: Densely packed, parallel bundles of type I collagen fibers with flattened fibroblasts

Tendons connect muscle to bone and must withstand strong, unidirectional tensile forces. This function is served by dense regular connective tissue, which is characterized by densely packed, parallel arrays of type I collagen fibers. Flattened fibroblasts (tenocytes) are aligned between these fiber bundles.

Question 66: Which rotator cuff muscle is unique in that it inserts on the lesser tubercle of the humerus, while the other three insert on the greater tubercle?

Infraspinatus
Teres Minor
Subscapularis (Correct answer)
Supraspinatus

Correct answer: Subscapularis

The subscapularis muscle is the only rotator cuff muscle that inserts on the lesser tubercle of the humerus. The supraspinatus, infraspinatus, and teres minor all have tendinous insertions on the greater tubercle.

Question 67: The 'clock-face' or 'cartwheel' chromatin pattern is characteristic of which connective tissue cell?

Mast cell
Macrophage
Plasma cell (Correct answer)
Fibroblast

Correct answer: Plasma cell

Plasma cells display a characteristic clock-face chromatin pattern due to heterochromatin arranged peripherally in the nucleus.

Question 68: Which layer of the skin contains blood vessels, nerve endings, and hair follicles?

Epidermis
Stratum corneum
Dermis (Correct answer)
Hypodermis

Correct answer: Dermis

The dermis is the deeper layer of skin that houses blood vessels, nerves, sweat glands, and hair follicles.

Question 69: The vestibulocochlear nerve (CN VIII) carries which functional modalities?

GSA only
SVA and GVA
GSA and GVA
SSA only (Correct answer)

Correct answer: SSA only

CN VIII carries only special somatic afferent (SSA) fibers, conveying hearing from the cochlear division and balance from the vestibular division.

Question 70: A renal carcinoma spreading within Gerota's fascia most likely involves which adjacent gland?

Parotid gland
Parathyroid gland
Thyroid gland
Suprarenal (adrenal) gland (Correct answer)

Correct answer: Suprarenal (adrenal) gland

The suprarenal gland shares Gerota's fascia with the kidney, so tumors within this compartment can spread to the adrenal gland.

Question 71: The frontal bone develops from how many primary ossification centers?

Four
Two (Correct answer)
Three
One

Correct answer: Two

The frontal bone develops from two ossification centers, one for each half, which normally fuse by age 6–8; failure to fuse leaves a metopic suture.

Question 72: In an adult, the larynx is located at approximately which vertebral level?

C3–C6 (Correct answer)
T1–T4
C7–T1
C1–C2

Correct answer: C3–C6

In adults, the larynx spans approximately C3–C6, with the cricoid cartilage at approximately C6, though exact position varies with age and neck posture.

Question 73: Which cranial nerve exits through the cribriform plate of the ethmoid bone?

CN III (Oculomotor)
CN I (Olfactory) (Correct answer)
CN V1 (Ophthalmic)
CN II (Optic)

Correct answer: CN I (Olfactory)

The olfactory nerve (CN I) consists of multiple fila olfactoria that pass through the perforations of the cribriform plate to reach the olfactory bulb.

Question 74: Which of the following clinical tests is most specific for infraspinatus and teres minor pathology?

Yergason's test
External rotation lag sign (Correct answer)
Speed's test
Neer impingement sign

Correct answer: External rotation lag sign

The external rotation lag sign tests external rotation strength, isolating the infraspinatus and teres minor.

Question 75: The term 'ipsilateral' refers to structures located on:

The inferior portion
Opposite sides of the body
The same side of the body (Correct answer)
The anterior surface

Correct answer: The same side of the body

Ipsilateral refers to structures on the same side of the body, for example, the right arm and right leg are ipsilateral to each other.

Question 76: The great cardiac vein runs in which sulcus?

Posterior interventricular sulcus
Right atrioventricular sulcus
Oblique sinus
Anterior interventricular sulcus (Correct answer)

Correct answer: Anterior interventricular sulcus

The great cardiac vein ascends in the anterior interventricular sulcus alongside the left anterior descending artery before continuing in the coronary sulcus.

Question 77: Anterior divisions of the brachial plexus trunks combine to form which cords?

Lateral and medial cords (Correct answer)
All three cords
Posterior cord only
Lateral cord only

Correct answer: Lateral and medial cords

The anterior divisions of the upper and middle trunks form the lateral cord; the anterior division of the lower trunk forms the medial cord.

Question 78: What is the primary function of the epiglottis?

To warm and humidify incoming air
To prevent food and liquids from entering the larynx during swallowing (Correct answer)
To produce mucus for the trachea
To filter inhaled particulates

Correct answer: To prevent food and liquids from entering the larynx during swallowing

The epiglottis folds over the glottis during swallowing to prevent food and liquids from entering the larynx and trachea.

Question 79: The tensor fasciae latae inserts via which structure?

Calcaneal tendon
Patellar ligament
Iliotibial (IT) band (Correct answer)
Pes anserinus

Correct answer: Iliotibial (IT) band

The tensor fasciae latae inserts via the iliotibial band (IT band) to the lateral condyle of the tibia.

Question 80: Which of the following tissue types performs the role of lining, protecting, and covering surfaces and bodily cavities?

Epithelial tissue (Correct answer)
Connective tissue
Nerve tissue
Muscle tissue

Correct answer: Epithelial tissue

Epithelial tissue is primarily responsible for lining, protecting, and covering surfaces and bodily cavities. It forms the outer layer of the skin, lines internal organs like the digestive and respiratory tracts, and covers glands. Its tightly packed cells create a barrier that regulates the passage of substances and provides protection against external factors.

Question 81: The junction where the sagittal suture and the coronal suture meet is a key anatomical landmark. In infants, this area corresponds to the anterior fontanelle. What is this point called in an adult skull?

Lambda
Asterion
Bregma (Correct answer)
Inion

Correct answer: Bregma

Bregma is the anatomical point on the skull where the coronal suture is intersected by the sagittal suture. [3] This location corresponds to the anterior fontanelle in an infant's skull. Lambda is the junction of the sagittal and lambdoid sutures. Asterion is where the lambdoid, occipitomastoid, and parietomastoid sutures meet. Inion refers to the most prominent point of the external occipital protuberance.

Question 82: Which structure passes through the foramen magnum?

Medulla oblongata (Correct answer)
Optic nerve
Internal carotid artery
Facial nerve

Correct answer: Medulla oblongata

The medulla oblongata passes through the foramen magnum as the brainstem continues into the spinal cord.

Question 83: Which rotator cuff muscle originates from the infraspinous fossa of the scapula?

Infraspinatus (Correct answer)
Subscapularis
Teres minor
Supraspinatus

Correct answer: Infraspinatus

The infraspinatus originates from the infraspinous fossa, which occupies most of the posterior scapular surface below the spine.

Question 84: Which of the following is NOT a primary function of the gluteus medius?

Hip extension (Correct answer)
Stabilizing the pelvis during gait
Medial rotation of the thigh
Hip abduction

Correct answer: Hip extension

The gluteus medius abducts and medially rotates the thigh and stabilizes the pelvis; hip extension is the primary role of the gluteus maximus.

Question 85: In a patient with liver cirrhosis, portal hypertension can cause venous blood to back up into the systemic circulation. Which vein, draining the abdominal part of the esophagus and being a tributary of the portal system, is a key site for the formation of esophageal varices?

Inferior thyroid vein
Hemiazygos vein
Azygos vein
Left gastric vein (Correct answer)

Correct answer: Left gastric vein

The abdominal portion of the esophagus is drained by the left gastric vein, which is a tributary of the portal vein. [10] In portal hypertension, blood flow is impeded, causing a portosystemic anastomosis to form between the left gastric vein and the azygos system (which drains the thoracic esophagus). This leads to dilated, fragile veins known as esophageal varices.

Question 86: Which nerve innervates the hamstring muscles?

Saphenous nerve
Obturator nerve
Sciatic nerve (Correct answer)
Femoral nerve

Correct answer: Sciatic nerve

The hamstrings are primarily innervated by the tibial division of the sciatic nerve, except the short head of biceps femoris (common fibular division).

Question 87: Which vessels return oxygenated blood directly to the left atrium?

Pulmonary veins (Correct answer)
Pulmonary arteries
Coronary veins
Superior and inferior vena cavae

Correct answer: Pulmonary veins

The four pulmonary veins (two from each lung) return oxygenated blood from the lungs to the left atrium.

Question 88: The squamous part of which bone forms a large portion of the lateral cranial vault?

Temporal bone (Correct answer)
Sphenoid bone
Occipital bone
Ethmoid bone

Correct answer: Temporal bone

The squamous part of the temporal bone is the flat, fan-shaped portion that forms a significant part of the lateral wall of the cranium.

Question 89: Injury to the posterior cord of the brachial plexus would spare which movement?

Shoulder abduction
Elbow flexion (Correct answer)
Wrist extension
Elbow extension

Correct answer: Elbow flexion

Elbow flexion (primarily musculocutaneous nerve) arises from the lateral cord, not the posterior cord.

Question 90: Which cranial nerve passes through the cribriform plate of the ethmoid bone?

Oculomotor Nerve (CN III)
Olfactory Nerve (CN I) (Correct answer)
Optic Nerve (CN II)
Trigeminal Nerve (CN V)

Correct answer: Olfactory Nerve (CN I)

The olfactory nerve (CN I) consists of numerous small nerve fascicles that pass through the small perforations of the cribriform plate in the ethmoid bone to synapse in the olfactory bulb.

Question 91: The peritoneum covers which surface of the kidney?

Both surfaces equally
Posterior surface
Anterior surface (Correct answer)
Neither surface

Correct answer: Anterior surface

The kidneys are retroperitoneal, so only their anterior surfaces are partially covered by peritoneum.

Question 92: What type of epithelium lines the body of the esophagus?

Simple columnar epithelium
Transitional epithelium
Non-keratinized stratified squamous epithelium (Correct answer)
Pseudostratified columnar epithelium

Correct answer: Non-keratinized stratified squamous epithelium

The esophagus is lined by non-keratinized stratified squamous epithelium, which resists the abrasion of food boluses.

Question 93: A minor calyx receives urine directly from which structure?

Renal papilla (Correct answer)
Ureter
Major calyx
Renal pelvis

Correct answer: Renal papilla

Each minor calyx cups one renal papilla (the apex of a pyramid) and collects urine draining from the collecting ducts.

Question 94: A pathology report describes a small, well-encapsulated tumor located at the superomedial aspect of the left kidney. This tumor is most likely compressing which adjacent structure?

Spleen
Tail of the pancreas
Descending colon
Left adrenal (suprarenal) gland (Correct answer)

Correct answer: Left adrenal (suprarenal) gland

The adrenal (or suprarenal) glands are situated on the superior and medial aspect of each kidney. A tumor at the superomedial pole of the left kidney would directly impinge upon the left adrenal gland. While the spleen, pancreas, and colon have anatomical relationships to the left kidney, they are not located at its immediate superomedial pole.

Question 95: Which statement best describes the relationship of the brachial plexus to the scalene muscles?

Trunks pass through the anterior scalene
Roots emerge posterior to the middle scalene
Roots emerge between anterior and middle scalenes (Correct answer)
Roots emerge anterior to the anterior scalene

Correct answer: Roots emerge between anterior and middle scalenes

The ventral rami (roots) of the brachial plexus pass between the anterior and middle scalene muscles in the posterior triangle.

Question 96: Which of the following organ systems matches its role correctly?

Cardiovascular / providing the first layer of protection from outside pathogens
Gastrointestinal / transport substances to all tissues of the body
Endocrine / regulation of homeostasis through hormone signaling (Correct answer)
Integumentary / obtaining nutrients necessary for growth, energy, and normal body processes

Correct answer: Endocrine / regulation of homeostasis through hormone signaling

The endocrine system is a network of glands that produce and secrete hormones into the bloodstream. These hormones act as chemical messengers, regulating various bodily functions and maintaining internal balance, known as homeostasis. This makes the endocrine system's role in hormone signaling and homeostasis regulation the correct match.

Question 97: Which nerve of the brachial plexus is most commonly injured in a posterior shoulder dislocation?

Suprascapular nerve
Musculocutaneous nerve
Radial nerve
Axillary nerve (Correct answer)

Correct answer: Axillary nerve

The axillary nerve is most vulnerable in shoulder dislocations due to its proximity to the surgical neck of the humerus.

Question 98: The medial cutaneous nerve of the forearm is a direct branch of which cord?

Posterior cord
Medial cord (Correct answer)
Middle trunk
Lateral cord

Correct answer: Medial cord

The medial cutaneous nerve of the forearm arises directly from the medial cord of the brachial plexus.

Question 99: Which nerve provides the primary motor innervation to the diaphragm?

Recurrent laryngeal nerve
Phrenic nerve (C3, C4, C5) (Correct answer)
Intercostal nerves (T1–T6)
Vagus nerve (CN X)

Correct answer: Phrenic nerve (C3, C4, C5)

The phrenic nerve, arising from cervical nerve roots C3, C4, and C5, provides the primary motor innervation to the diaphragm — summarized by the mnemonic 'C3, 4, 5 keeps the diaphragm alive.'

Question 100: Which cranial bone contains the sella turcica?

Frontal bone
Temporal bone
Ethmoid bone
Sphenoid bone (Correct answer)

Correct answer: Sphenoid bone

The sella turcica ('Turkish saddle') is a saddle-shaped depression in the body of the sphenoid bone that houses the pituitary gland.

Human Anatomy and Physiology Exam

The Human Anatomy and Physiology Exam assesses knowledge of gross anatomy, histology, neuroanatomy, and organ system structure, covering cranial nerves, cardiac anatomy, brachial plexus, connective tissue histology, musculoskeletal structures, gastrointestinal tract, renal anatomy, cranial bones, joint mechanics, and the lymphatic system.

100

Questions

90 min

Time Limit

70%

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