BCSE Anatomy 4 — Questions and Answers
Question 1: Which ligament of the knee prevents anterior displacement of the tibia on the femur?
- Posterior cruciate ligament
- Medial collateral ligament
- Anterior cruciate ligament (Correct answer)
- Arcuate ligament
Correct answer: Anterior cruciate ligament
The anterior cruciate ligament (ACL) prevents anterior translation of the tibia relative to the femur, tested by the anterior drawer test.
Question 2: The thoracic duct drains into the venous system at which location?
- Right subclavian vein
- Superior vena cava
- Left subclavian–jugular junction (Correct answer)
- Brachiocephalic vein
Correct answer: Left subclavian–jugular junction
The thoracic duct empties into the junction of the left subclavian vein and the left internal jugular vein.
Question 3: Which muscle is the primary internal rotator of the hip?
- Gluteus maximus
- Piriformis
- Gluteus medius (anterior fibers) (Correct answer)
- Obturator externus
Correct answer: Gluteus medius (anterior fibers)
The anterior fibers of the gluteus medius are the primary internal rotators of the hip; the posterior fibers externally rotate.
Question 4: The Wrist drop seen after a Saturday night palsy is caused by injury to which nerve?
- Median nerve at the wrist
- Ulnar nerve at the elbow
- Radial nerve in the axilla (Correct answer)
- Musculocutaneous nerve in the arm
Correct answer: Radial nerve in the axilla
Saturday night palsy compresses the radial nerve in the axilla (e.g., against a chair back), paralyzing wrist and finger extensors and causing wrist drop.
Question 5: Which foramen transmits the facial nerve (CN VII) out of the skull?
- Jugular foramen
- Stylomastoid foramen (Correct answer)
- Foramen spinosum
- Internal acoustic meatus
Correct answer: Stylomastoid foramen
The facial nerve exits the skull via the stylomastoid foramen before entering the parotid gland and branching into its terminal divisions.
Question 6: Which layer of the epidermis undergoes the most mitotic activity?
- Stratum corneum
- Stratum granulosum
- Stratum basale (Correct answer)
- Stratum spinosum
Correct answer: Stratum basale
The stratum basale (germinativum) is the deepest epidermal layer and the primary site of keratinocyte mitosis and renewal.
Question 7: The celiac trunk is the first unpaired branch of the abdominal aorta and typically divides into which three branches?
- Left gastric, splenic, common hepatic arteries (Correct answer)
- Superior mesenteric, inferior mesenteric, splenic arteries
- Hepatic, gastroduodenal, right gastric arteries
- Left gastric, right gastric, gastroduodenal arteries
Correct answer: Left gastric, splenic, common hepatic arteries
The celiac trunk classically trifurcates into the left gastric artery, splenic artery, and common hepatic artery.
BCSE Anatomy 4
Which ligament of the knee prevents anterior displacement of the tibia on the femur?