USMLE Anatomy 3

Question 1

Which cranial nerve exits the skull through the foramen ovale?

Accepted Answer

Mandibular nerve (CN V3)

Answer

Maxillary nerve (CN V2)

Answer

Ophthalmic nerve (CN V1)

Answer

Facial nerve (CN VII)

Question 2

A patient presents with weakness of finger abduction and adduction, loss of sensation over the medial 1.5 fingers and hypothenar eminence, and a 'claw hand' deformity affecting primarily the ring and little fingers. Which nerve is most likely injured?

Accepted Answer

Ulnar nerve

Answer

Median nerve

Answer

Radial nerve

Answer

Musculocutaneous nerve

Question 3

The blood-testis barrier, which protects developing germ cells from immune surveillance, is formed by tight junctions between which cells?

Accepted Answer

Sertoli cells

Answer

Leydig cells

Answer

Primary spermatocytes

Answer

Myoid cells

Question 4

Which of the following structures is located in the posterior mediastinum?

Accepted Answer

Thoracic duct

Answer

Thymus gland

Answer

Superior vena cava

Answer

Phrenic nerve

Question 5

A 68-year-old man presents with progressive hoarseness. Imaging reveals a large aortic arch aneurysm. Which nerve is most likely compressed by this aneurysm?

Accepted Answer

Left recurrent laryngeal nerve

Answer

Right recurrent laryngeal nerve

Answer

Left superior laryngeal nerve

Answer

Left phrenic nerve

Question 6

Which muscle is responsible for 'unlocking' the knee from full extension to allow flexion to begin?

Accepted Answer

Popliteus

Answer

Quadriceps femoris

Answer

Gastrocnemius

Answer

Plantaris

Question 7

Which of the following structures does NOT pass through the carpal tunnel?

Accepted Answer

Ulnar nerve

Answer

Median nerve

Answer

Flexor digitorum superficialis tendons

Answer

Flexor pollicis longus tendon