USMLE Anatomy 2

Question 1

A patient sustains a fibular neck fracture and subsequently develops foot drop with loss of sensation over the dorsum of the foot. Which nerve was most likely injured?

Accepted Answer

Common fibular (peroneal) nerve

Answer

Tibial nerve

Answer

Sural nerve

Answer

Saphenous nerve

Question 2

Which of the following structures correctly passes through the inguinal canal in males?

Accepted Answer

Ilioinguinal nerve and spermatic cord

Answer

Round ligament of the uterus

Answer

Femoral nerve

Answer

Obturator nerve

Question 3

When performing a lumbar puncture at L4-L5, which sequence of structures does the needle correctly traverse from superficial to deep?

Accepted Answer

Skin → supraspinous ligament → interspinous ligament → ligamentum flavum → epidural space → dura mater → subdural space → arachnoid mater → subarachnoid space

Answer

Skin → interspinous ligament → supraspinous ligament → epidural space → dura mater → arachnoid mater → subarachnoid space

Answer

Skin → ligamentum flavum → interspinous ligament → supraspinous ligament → epidural space → dura mater → subarachnoid space

Answer

Skin → supraspinous ligament → ligamentum flavum → interspinous ligament → epidural space → dura mater → subarachnoid space

Question 4

A patient develops a 'winged scapula' following a radical mastectomy with axillary dissection. Which nerve was most likely damaged during the procedure?

Accepted Answer

Long thoracic nerve

Answer

Accessory nerve (CN XI)

Answer

Thoracodorsal nerve

Answer

Medial pectoral nerve

Question 5

The sinoatrial (SA) node receives its arterial supply from the SA nodal artery, which arises from which vessel in approximately 60% of individuals?

Accepted Answer

Right coronary artery

Answer

Left anterior descending artery

Answer

Left circumflex artery

Answer

Posterior descending artery

Question 6

A patient presents with inability to initiate arm abduction—unable to abduct beyond 15 degrees—after an anterior shoulder dislocation. Which muscle was most likely injured?

Accepted Answer

Supraspinatus

Answer

Infraspinatus

Answer

Teres minor

Answer

Subscapularis

Question 7

A patient develops a Pancoast tumor at the apex of the right lung and presents with ptosis, miosis, and anhidrosis on the right side of the face. Which structure is most likely being compressed?

Accepted Answer

Cervical sympathetic chain

Answer

Right vagus nerve

Answer

Right phrenic nerve

Answer

Brachial plexus upper trunk (C5-C6)