7. Hand and Wrist MCQs

Which of the following tendons is contained within the third extensor compartment of the wrist?

The ulnar nerve passes through Guyon's canal at the wrist. Which of the following structures forms the floor of this canal?

A Martin-Gruber anastomosis is a well-documented anatomical variant. This anomaly most commonly involves the transfer of motor fibers from which nerve to which nerve?

Lanz classified the anatomical variations of the recurrent motor branch of the median nerve. Which of the following is the most common anatomic path of this branch?

Lister's tubercle serves as a bony fulcrum for a major extensor tendon of the wrist and hand. This tendon resides in which dorsal extensor compartment?

During an ulnar nerve transposition, the medial intermuscular septum is excised to prevent compression of the nerve. What structure is most at risk of injury when excising this septum?

What is the most radial structure within the carpal tunnel?

The lumbrical muscles of the hand originate from the tendons of the flexor digitorum profundus. Which nerve typically innervates the first and second lumbricals?

The floor of the cubital tunnel is formed by which of the following structures?

The lumbrical muscles of the hand play a key role in fine motor movements by flexing the metacarpophalangeal joints and extending the interphalangeal joints. Which of the following best describes the typical origin and innervation of the third lumbrical?

During an open carpal tunnel release, the recurrent motor branch of the median nerve must be avoided. In a standard textbook description (extraligamentous origin), where does this branch typically originate and how does it course?

Based on a normal cross-section of the forearm (as seen in Figure 6), the anterior interosseous nerve (AIN) courses distally along the interosseous membrane. Which of the following muscles is NOT innervated by the AIN?

A patient presents with a deep penetrating injury to the palm and demonstrates an inability to forcefully cross the index and middle fingers. Which of the following nerves is most likely injured?

The deep motor branch of the ulnar nerve passes between the pisiform and the hook of the hamate in Guyon's canal. Which of the following structures forms the roof of this canal?

When decompressing Guyon's canal for ulnar nerve entrapment, a surgeon must be intimately aware of its boundaries. Which of the following structures forms the floor of Guyon's canal?

Compression of the posterior interosseous nerve (PIN) most commonly occurs at the Arcade of Frohse. This arcade is formed by the proximal aponeurotic edge of which muscle?

A patient sustains a deep laceration to the palm, severing the deep branch of the ulnar nerve. Which of the following functional deficits is most likely to be observed?

A patient sustains a deep laceration over the volar aspect of the index finger metacarpophalangeal joint. The first lumbrical muscle is injured. What is its precise origin and innervation?

A 45-year-old mechanic complains of chronic, aching pain in the proximal lateral forearm without overt motor weakness, exacerbated by resisted forearm supination. The most common site of compression for the involved nerve is the:

A patient complains of ulnar-sided wrist pain after a fall. MRI shows a tear of the foveal attachment of the Triangular Fibrocartilage Complex (TFCC). This specific attachment is critical for: