Hand Muscle Chart

Question 1

Flexor pollicis brevis

Answer 1

Superficial head: Recurrent branch of median;

Deep head: Deep branch of ulnar

Question 2

Lumbricals 1st and 2nd innervation

Answer 2

Median

Question 3

Posterior interosseous (continuation of deep radial)

Answer 3

Abductor pollicis longus
Extensor pollicis brevis
Extensor pollicis longus
Extensor Indicis

Question 4

Extensor carpi radialis longus innervation

Answer 4

Radial

Question 5

Abductor pollicis brevis action

Answer 5

Abducts thumb; helps to oppose it

Question 6

Flexor pollicis brevis

Answer 6

Flexes thumb

Question 7

Opponens pollicis

Answer 7

Opposes thumb; draws 1st metacarpal medially to center of palm and rotates it medially

Question 8

Adductor pollicis

Answer 8

Adducts thumb toward lateral border of palm

Question 9

Abductor digiti minimi

Answer 9

Abducts 5th digit; assists in flexion of its proximal phalanx

Question 10

Flexor digiti minimi

Answer 10

Flexes proximal phalanx of 5th digit

Question 11

Lumbricals 1st and 2nd action

Answer 11

Flex metacarpophalangeal joints; extend interphalangeal joints of 2nd-5th digits

Question 12

Lumbricals 3rd and 4th

Answer 12

Flex metacarpophalangeal joints; extend interphalangeal joints of 2nd-5th digits

Question 13

Dorsal interossei (1st-4th)

Answer 13

Abduct 2nd-4th digits from axial line; act with lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints

Question 14

Palmar interossei (1st-3rd)

Answer 14

Adduct 2nd, 4th and 5th digits toward axial line; assist with lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints

Question 15

Extensor carpi radialis longus

Answer 15

Extend and abduct hand at wrist joint; active during fist clenching

Question 16

Extensor carpi radialis brevis

Answer 16

Extend and abduct hand at wrist joint

Question 17

Extensor digitorum

Answer 17

Extends medial four digits primarily at metacarpophalangeal joints, secondarily at interphalangeal joints

Question 18

Extensor indicis

Answer 18

Extends 2nd digit and helps extend hand at wrist

Question 19

Extensor digiti minimi

Answer 19

Extends 5th digit primarily at metacarpophalangeal joint, secondarily at interphalangeal joint

Question 20

Extensor pollicis longus

Answer 20

Extends distal phalanx of thumb at interphalangeal joint; extends metacarpophalangeal and carpometacarpal joint

Question 21

Extensor pollicis brevis

Answer 21

Extends proximal phalanx of thumb at metacarpophalangeal joint; extends carpometacarpal joint

Question 22

Abductor pollicis longus

Answer 22

Abducts thumb and extends it at carpometacarpal joint

Question 23

Extensor carpi ulnaris

Answer 23

Extends and adducts hand at wrist joint; also active during fist clenching

Question 24

Supinator

Answer 24

Supinates forearm

Question 25

Recurrent branch of median

Answer 25

Abductor pollicis brevis and Opponens pollicis

Question 26

Deep branch of ulnar

Answer 26

Adductor pollicis, Abductor digiti minimi, Flexor digiti minimi, Lumbricals 3rd and 4th, Dorsal interossei (1st-4th), Palmar interossei (1st-3rd)

Question 27

Deep branch of radial

Answer 27

Extensor carpi radialis brevis, Extensor digitorum, Extensor digiti minimi, Extensor carpi ulnaris, Supinator