7. Hand and Wrist MCQs

A 30-year-old man presents with an inability to cross his fingers and numbness over the volar aspect of his small finger following a deep laceration to his proximal medial forearm. Which cord of the brachial plexus gives rise to the nerve injured in this scenario?

A patient presents with a "lumbrical plus" finger after a flexor digitorum profundus (FDP) tendon laceration in zone 1. What is the anatomic origin and insertion of the lumbrical muscle that contributes to this phenomenon?

A patient has isolated weakness in flexing the interphalangeal joint of the thumb and the distal interphalangeal joint of the index finger. There is no sensory loss. Compression of the involved nerve most commonly occurs at which of the following anatomical structures?

Which of the following structures is innervated by the anterior interosseous nerve (AIN)?

Which of the following statements accurately describes the Martin-Gruber anastomosis?

During an ulnar nerve decompression at the wrist, the surgeon releases the volar carpal ligament to open Guyon's canal. Which structures represent the medial and lateral bony borders of this canal?

Fractures of the scaphoid proximal pole are prone to nonunion and avascular necrosis due to its precarious blood supply. From which vessel does the scaphoid receive its primary blood supply, and where does it enter the bone?

The flexor tendon pulley system of the hand prevents bowstringing of the tendons during digital flexion. Which two pulleys are considered the most critical to the biomechanical function of the digit and must be preserved or reconstructed?

The scapholunate interosseous ligament (SLIL) provides primary stability to the scapholunate joint. Which anatomic portion of the SLIL is the thickest and most biomechanically critical for preventing diastasis?

The anterior interosseous nerve (AIN) is a purely motor branch that courses through the volar forearm. Which of the following muscles is NOT innervated by the AIN?

In a Bennett fracture-dislocation of the thumb base, a small volar-ulnar fragment remains anatomically reduced while the shaft displaces. Which structure maintains this fragment in its anatomic position?

A 35-year-old avid cyclist presents with profound weakness of finger abduction and adduction but normal sensation over the volar small finger. A lesion in Zone II of Guyon's canal is suspected. Which of the following structures forms the floor of Guyon's canal?

A patient sustained a midshaft humerus fracture and later developed an inability to flex the interphalangeal joint of the thumb and the distal interphalangeal joint of the index finger. The affected nerve typically branches from its parent nerve at which of the following anatomic locations?

During a primary flexor tendon repair in Zone II, the surgeon must preserve the critical pulley system to prevent flexor tendon bowstringing. Anatomically, where does the A2 pulley originate?

During an open reduction and internal fixation of a distal radius fracture via a volar approach (Henry), the flexor carpi radialis (FCR) is retracted medially. The surgeon must be careful to avoid injury to which of the following structures immediately ulnar to the FCR tendon?

The Martin-Gruber anastomosis most commonly involves a transfer of motor nerve fibers from the:

Which of the following structures forms the roof of the cubital tunnel?

During surgical release of De Quervain's tenosynovitis, the surgeon must identify and protect branches of which of the following nerves to avoid painful neuroma formation?

During carpal tunnel release surgery, the recurrent motor branch of the median nerve must be avoided. What is the most common anatomical variation of this branch relative to the transverse carpal ligament?

A patient presents with a deep infection of the midpalmar space. The infection is most likely to spread proximally into the forearm via which of the following structures?