Hand Muscles

Question 1

oppenens pollicis innervation

Answer 1

recurrent branch of median nerve (C8, T1)

Question 2

oppenens pollicis action

Answer 2

to oppose thumb, it draws 1st metacarpal medially to center of palm and rotates it medially

Question 3

abductor pollicis brevis innervation

Answer 3

recurrent branch of median nerve (C8, T1)

Question 4

abductor pollicis brevis action

Answer 4

abducts thumb; helps oppose it

Question 5

flexor pollicis brevis (superficial and deep head) innervation

Answer 5

recurrent branch of median nerve (C8, T1)

Question 6

flexor pollicis brevis (superficial and deep head) action

Answer 6

flexes thumb

Question 7

adductor pollicis (oblique and transverse head) innervation

Answer 7

deep branch of ulnar nerve (C8, T1)

Question 8

adductor pollicis (oblique and transverse head) action

Answer 8

adducts thumb toward lateral border of palm

Question 9

abductor digiti minimi innervation

Answer 9

deep branch of ulnar nerve (C8, T1)

Question 10

abductor digiti minimi action

Answer 10

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

Question 11

flexor digiti minimi brevis innervation

Answer 11

deep branch of ulnar nerve (C8, T1)

Question 12

flexor digiti minimi brevis action

Answer 12

flexes proximal phalanx of 5th digit

Question 13

oppenens digiti minimi innervation

Answer 13

deep branch of ulnar nerve (C8, T1)

Question 14

oppenens digiti minimi action

Answer 14

draws 5th metacarpal anterior and rotates it, bringing 5th digit into opposition with thumb

Question 15

1st and 2nd lumbricals innervation

Answer 15

median nerve (C8, T1)

Question 16

1st and 2nd lumbricals action

Answer 16

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

Question 17

3rd and 4th lumbricals innervation

Answer 17

deep branch of ulnar nerve (C8, T1)

Question 18

3rd and 4th lumbricals action

Answer 18

flex metacarpophalangeal joints; extend interphalangeal joints

Question 19

dorsal interossei, 1st-4th lumbricals innervation

Answer 19

deep branch of ulnar nerve (C8, T1)

Question 20

dorsal interossei, 1st-4th lumbricals action

Answer 20

abduct digits from axial line; act with lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints

Question 21

palmar interossei, 1st-3rd lumbricals innervation

Answer 21

deep branch of ulnar nerve (C8, T1)

Question 22

palmar interossei, 1st-3rd lumbricals action

Answer 22

adduct digits toward axial line, assist lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints