Muscles of Hand

Question 1

abductor pollicis brevis (APB) proximal attachment

Answer 1

flexor retinaculum and tubercles of scaphoid and trapezium

Question 2

APB distal attachment

Answer 2

lateral side of base of proximal phalanx of thumb

Question 3

APB innervation

Answer 3

recurrent branch of median nerve (C8, T1)

Question 4

APB muscle action

Answer 4

abducts thumb, helps oppose it

Question 5

Flexor pollicis brevis (FPB) superficial head and deep head proximal attachment

Answer 5

flexor retinaculum and tubercles of scaphoid and trapezium (same as APB)

Question 6

FPB superficial head and deep head distal attachment

Answer 6

lateral side of base of proximal phalanx of thumb (same as APB)

Question 7

FPB superficial head innervation

Answer 7

recurrent branch of median nerve (C8, T1)

Question 8

FPB deep head innervation

Answer 8

deep branch of ulnar nerve (C8, T1)

Question 9

opponens pollicis proximal attachment

Answer 9

flexor retinaculum and tubercles of scaphoid and trapezium (same as APB and FPB)

Question 10

opponens pollicis distal attachment

Answer 10

lateral side of 1st metacarpal

Question 11

opponens pollicis innervation

Answer 11

recurrent branch of median nerve (C8, T1)

Question 12

opponens pollicis muscle action

Answer 12

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

Question 13

adductor pollicis oblique head proximal attachment

Answer 13

base of 2nd and 3rd metacarpal, capitate and adjacent carpals

Question 14

adductor pollicis transverse head proximal attachment

Answer 14

anterior surface of shaft of 3rd metacarpal

Question 15

adductor pollicis oblique and transverse head distal attachment

Answer 15

medial side of base of proximal phalanx of thumb

Question 16

adductor pollicis innervation

Answer 16

deep branch of ulnar nerve (C8, T1)

Question 17

adductor pollicis muscle action

Answer 17

adducts thumb toward lateral border of palm

Question 18

dorsal interossei muscles 1-4 proximal attachment

Answer 18

adjacent side of two metacarpals

Question 19

dorsal interossei 1-4 distal attachment

Answer 19

bases of proximal phalanges; extensor expansions of digits 2-4

Question 20

dorsal interossei 1-4 innervation

Answer 20

deep branch of ulnar nerve (C8, T1)

Question 21

dorsal interossei 1-4 muscle action

Answer 21

abduct digits 2-4 from axial line; act with lumbricals to flex metacarpophlangeal joints and extending interphalangeal joints

Question 22

palmar interossei 1-3 proximal attachment

Answer 22

palmar surfaces of metacarpals 2,4,5

Question 23

palmar interossei 1-3 distal attachment

Answer 23

bases of proximal phalanges, extensor expansions of digits 2,4,5

Question 24

palmar interossei innervation

Answer 24

deep branch of ulnar nerve (C8, T1)

Question 25

palmar interossei 1-3 muscle action

Answer 25

adduct 2,4,5 digits toward axial line. assist lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints; extensor expansions of 2-4 digits

Question 26

1st and 2nd lumbrical proximal attachment

Answer 26

lateral two tendons of flexor digitorum profundus

Question 27

1st and 2nd lumbrical distal attachment

Answer 27

lateral sides of extensor expansions of 2nd and 5th digits

Question 28

1st and 2nd lumbrical innervation

Answer 28

median nerve (C8, T1)

Question 29

1st and 2nd lumbrical muscle action

Answer 29

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

Question 30

abductor digiti minimi (ADM) proximal attachment

Answer 30

pisiform

Question 31

ADM distal attachment

Answer 31

medial side of base of proximal phalanx of 5th digit

Question 32

ADM innervation

Answer 32

deep branch of ulnar nerve (C8, T1)

Question 33

ADM muscle action

Answer 33

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

Question 34

flexor digiti minimi (FDM) brevis proximal attachment

Answer 34

hook of hamate and flexor retinaculum

Question 35

FDM brevis distal attachment

Answer 35

medial side of base of proximal phalanx of 5th digit

Question 36

FDM brevis innervation

Answer 36

deep branch of ulnar nerve (C8, T1)

Question 37

FDM brevis muscle action

Answer 37

flexes proximal phalanx of 5th digit

Question 38

opponens digiti minimi (ODM) proximal attachment

Answer 38

hook of hamate and flexor retinaculum

Question 39

ODM distal attachment

Answer 39

medial border of 5th metacarpal

Question 40

ODM innervation

Answer 40

deep branch of ulnar nerve (C8, T1)

Question 41

what runs through the guyon's tunnel?

Answer 41

ulnar nerve and ulnar artery

Question 42

floor of guyon's tunnel

Answer 42

flexor retinaculum

Question 43

roof of guyon's tunnel

Answer 43

volar carpal ligament