CHT CHT Hand Anatomy & Biomechanics

Question 1

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

Accepted Answer

A2 pulley

Answer

A1 pulley

Answer

A4 pulley

Answer

C1 pulley

Question 2

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

Accepted Answer

IP extension with MCP flexion

Answer

MCP extension with IP flexion

Answer

Full composite flexion

Answer

Wrist radial deviation

Question 3

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

Accepted Answer

Scaphoid

Answer

Lunate

Answer

Capitate

Answer

Trapezium

Question 4

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

Accepted Answer

Abductor pollicis brevis

Answer

Hypothenar muscles

Answer

Dorsal interossei

Answer

Palmaris brevis

Question 5

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

Accepted Answer

85–90°

Answer

50–60°

Answer

70–80°

Answer

95–100°

Question 6

Which structure forms the floor of the carpal tunnel?

Accepted Answer

Carpal bones

Answer

Flexor retinaculum

Answer

Palmar fascia

Answer

Transverse carpal ligament