USMLE Anatomy

Question 1

The femoral sheath is divided into three compartments. Which structure occupies the most medial compartment (femoral canal)?

Accepted Answer

Lymphatics and loose connective tissue

Answer

Femoral artery

Answer

Femoral vein

Answer

Femoral nerve

Question 2

A patient presents with weakness of hip flexion and knee extension along with loss of sensation over the anterior thigh and medial leg. Which nerve is most likely damaged?

Accepted Answer

Femoral nerve

Answer

Obturator nerve

Answer

Sciatic nerve

Answer

Lateral femoral cutaneous nerve

Question 3

During a thyroidectomy a surgeon must preserve all intrinsic laryngeal muscles. Which muscle is NOT innervated by the recurrent laryngeal nerve?

Accepted Answer

Cricothyroid

Answer

Posterior cricoarytenoid

Answer

Lateral cricoarytenoid

Answer

Thyroarytenoid

Question 4

A patient sustains a stab wound to the posterior triangle of the neck and subsequently develops shoulder droop with difficulty elevating the arm above 90 degrees. Which nerve was most likely injured?

Accepted Answer

Accessory nerve (CN XI)

Answer

Phrenic nerve

Answer

Long thoracic nerve

Answer

Dorsal scapular nerve

Question 5

As the ureter descends into the pelvis, it crosses posterior to which structure at the pelvic brim?

Accepted Answer

Common iliac artery bifurcation

Answer

External iliac artery

Answer

Internal iliac artery

Answer

Femoral artery

Question 6

Which of the following best describes the drainage territory of the right lymphatic duct?

Accepted Answer

Right side of the head, neck, thorax, and right upper limb

Answer

Entire right side of the body

Answer

All structures below the diaphragm on the right

Answer

Right lower limb and right side of the abdomen

Question 7

A patient with a Colles' fracture develops weakness of thumb opposition and loss of sensation over the lateral palm and first 3.5 fingers. Which nerve is most likely affected?

Accepted Answer

Median nerve

Answer

Ulnar nerve

Answer

Radial nerve

Answer

Musculocutaneous nerve