Muscles of the Hand

Question 1

Abductor pollicis brevis

Answer 1

• Tubercles of scaphoid trapezium and adjacent flexor
retinaculum

• Proximal phalanx
• extensor hood of thumb
retinaculum

• Abducts thumb at MCP joint
• Recurrent branch of median n. [C8,T1]

Question 2

Flexor pollicis brevis

Answer 2

• Tubercle of the trapezium
• Flexor retinaculum
• Proximal phalanx of the thumb
• Flexes thumb at MCP joint
• Recurrent branch of median n. [C8,T1]

Question 3

Opponens pollicis

Answer 3

• Tubercle of trapezium and flexor retinaculum
• Lateral margin and adjacent palmar surface of 1st MC
• Medially rotates thumb
• Recurrent branch of median n. [C8,T1]

Question 4

Abductor digiti minimi

Answer 4

• Pisiform, the pisohamate ligament
• tendon of flexor carpi ulnaris
• Proximal phalanx of little finger
• Abducts little finger at MCP joint
• Deep branch of ulnar n. [C8,T1}

Question 5

Flexor digiti minimi

Answer 5

• Hook of the hamate
• Flexor retinaculum
• Proximal phalanx of little finger
• Flexion of little finger at MCP joint
• Deep branch of ulnar n. [C8,T1}

Question 6

Opponens digiti minimi

Answer 6

• Hook of the hamate
• Flexor retinaculum
• Medial aspect of 5th MC
• Lateral rotation of 5th MC
• Deep branch of ulnar n. [C8,T1}

Question 7

Adductor pollicis

Answer 7

• Transverse head: 3rd MC oblique head:
• capitate and base of 2nd and 3rd MC.
• Base of proximal phalanx
• extensor hood of thumb
• Adduction of thumb
• Deep branch of ulnar n. [C8,T1]

Question 8

Lumbricals

Answer 8

• Tendons of flexor digitorum profundus
• Extensor hoods of index, ring, middle, and little fingers
• Flexion of MCP joints
• extension of IP joints

Medial two:
• Deep branch of the
   ulnar n. (C8,T1) 
Lateral two:
• Digital branches of the median n. (C8,T1

Question 9

Dorsal interossei

Answer 9

• Adjacent sides of MCs
• Extensor hood and base of proximal phalanges of index, middle, and ring fingers
• Abduction of index, middle, and ring fingers at the MCP joints
• Deep branch of ulnar n. [C8,T1]

Question 10

Palmar interossei

Answer 10

• Sides of MCs
• Extensor hoods of the index, ring, and little fingers
• Adduction of the index, ring, and little fingers at MCP joints
• Deep branch of ulnar n. [C8,T1]