Wrist and Hand Muscles Flashcards Preview

S1 Anatomy > Wrist and Hand Muscles > Flashcards

Flashcards in Wrist and Hand Muscles Deck (47):
1

muscles of the thenar eminence

abductor pollicis brevis
flexor pollicis brevis
opponens pollicis
adductor pollicis

2

abductor pollicis brevis
-origin

flexor retinaculum
tubercles of scaphoid and trepezium

3

abductor pollicis brevis
-insertion

lateral side of base of proximal phalanx of thumb

4

abductor pollicis brevis
-action

thumb abduction
helps with thumb opposition

5

abductor pollicis brevis
-innervation

recurrent branch of median nerve (C8, T1)

6

flexor pollicis brevis
-origin

superficial head
-flexor retinaculum
-tubercle of trapezium
deep head
-floor of carpal tunnel

7

flexor pollicis brevis
-insertion

lateral side of base of proximal phalanx of thumb

8

flexor pollicis brevis
-action

flexes thumb

9

flexor pollicis brevis
-innervation

superficial head
-recurrent branch of median nerve (C8, T1)
deep head
-deep branch of ulnar nerve (C8, T1)

10

opponens pollicis
-origin

flexor retinaculum
tubercle of trapezium

11

opponens pollicis
-insertion

lateral side of base of proximal phalanx of thumb

12

opponens pollicis
-actions

opposes thumb toward center of palm
rotates it medially

13

opponens pollicis
-innervation

recurrent branch of median nerve (C8, T1)
also possibly deep branch of ulnar nerve

14

adductor pollicis
-origin

oblique head
-bases of metacarpal 2, 3
-capitate
-adjacent carpal bones
transverse head
-anterior surface of 3rd metacarpal

15

adductor pollicis
-insertion

medial side of base of proximal phalanx of thumb

16

adductor pollicis
-actions

adducts thumb toward middle digit

17

adductor pollicis
-innervation

deep branch of ulnar nerve (C8, T1)

18

abductor digiti minimi
-origin

pisiform bone

19

abductor digiti minimi
-insertion

medial side of base of proximal phalanx of digit 5

20

abductor digiti minimi
-action

abducts digit 5

21

abductor digiti minimi
-innervation

deep branch of ulnar nerve (C8, T1)

22

flexor digiti minimi brevis
-origin

hook of hamate
flexor retinaculum

23

flexor digiti minimi brevis
-insertion

medial side of base of proximal phalanx of digit 5

24

flexor digiti minimi brevis
-action

flexes proximal phalanx of digit 5

25

flexor digiti minimi brevis
-innervation

deep branch of ulnar nerve (C8, T1)

26

opponens digiti minimi
-origin

hook of hamate
flexor retinaculum

27

opponens digiti minimi
-insertion

medial border of 5th metacarpal

28

opponens digiti minimi
-action

draws 5th metacarpal bone anteriorly and rotates it to bring digit 5 into opposition to thumb

29

opponens digiti minimi
-innervation

deep branch of ulnar nerve (C8, T1)

30

muscles of hypothenar eminence

abductor digiti minimi
flexor digiti minimi brevis
opponens digiti minimi

31

lumbricals 1 and 2
-origin

lateral two tendons of flexor digitorum profundus (index and middle finger)

32

lumbricals 1 and 2
-insertion

lateral sides of extensor expansions of digits 2 and 3

33

lumbricals 1 and 2
-action

flex digits at MCP joint
extend IP joints

34

lumbricals 1 and 2
-innervation

median nerve (C8, T1)

35

lumbricals 3 and 4
-origin

medial two tendons of flexor digitorum profundus (ring and little finger)

36

lumbricals 3 and 4
-insertion

lateral sides of extensor expansions of digits 4 and 5

37

lumbricals 3 and 4
-action

flex digits at MCP joint
extend IP joints

38

lumbricals 3 and 4
-innervation

deep branch of ulnar nerve (C8, T1)

39

dorsal interossei 1-4
-origin

adjacent sides of two metacarpal bones

40

dorsal interossei 1-4
-insertion

extensor expansions and bases of proximal phalanges of digits 2-4
middle finger has 2 insertions

41

dorsal interossei 1-4
-action

abduct digits
assist lumbricals in extension at the IP joints

42

dorsal interossei 1-4
-innervation

deep branch of ulnar nerve (C8, T1)

43

palmar interossei 1-3
-origin

palmar surfaces of 2nd, 4th, and 5th metacarpals

44

palmar interossei 1-3
-insertion

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

45

palmar interossei 1-3
-action

adduct digits
assist lumbricals in flexion at the MCP joint

46

palmar interossei 1-3
-innervation

deep branch of ulnar nerve (C8, T1)

47

short muscles of the hand

lumbricals 1-4
dorsal interossei 1-4
palmar interossei 1-3