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CHT Hand Anatomy & Biomechanics Flashcards

6 cards from real CHT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. Which pulley in the flexor tendon sheath is considered the most biomechanically critical for efficient finger flexion?

    Answer: A2 pulley

    The A2 pulley, located over the proximal phalanx, is the most critical annular pulley because its integrity prevents bowstringing of the flexor tendon during finger flexion.

  2. The intrinsic muscles of the hand are primarily responsible for which combined finger motion?

    Answer: IP extension with MCP flexion

    The intrinsic muscles (lumbricals and interossei) produce MCP flexion combined with IP extension, enabling the intrinsic-plus hand posture.

  3. Which carpal bone is most commonly fractured and is at high risk for avascular necrosis due to its retrograde blood supply?

    Answer: Scaphoid

    The scaphoid receives its blood supply distally and retrogradely, so proximal pole fractures disrupt perfusion and risk avascular necrosis.

  4. The ulnar nerve provides motor innervation to all of the following EXCEPT:

    Answer: Abductor pollicis brevis

    The abductor pollicis brevis is innervated by the median nerve (recurrent motor branch), not the ulnar nerve.

  5. The normal range of motion for metacarpophalangeal (MCP) flexion in the index finger is approximately:

    Answer: 85–90°

    Normal MCP flexion in the index finger ranges from approximately 85° to 90°, progressively increasing toward the small finger.

  6. Which structure forms the floor of the carpal tunnel?

    Answer: Carpal bones

    The carpal bones form the floor (dorsal wall) of the carpal tunnel, while the flexor retinaculum (transverse carpal ligament) forms the roof.