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Flashcards in Hand - intrinsic muscles Deck (30):
1

which nerve innervates the thenar muscles?

median

2

what digit do the thenars act upon?

thumb (first digit)

3

name the 3 thenar muscles

oppenens pollicis
abductor pollicis brevis
flexor pollicis brevis

4

how many thenar muscles are there?

3

5

what is the action of oppenens pollicis?

opposes thumb - by rotating and flexing the metacarpal on the trapezium

6

what is the action of abductor pollicis brevis?

abducts thumb

7

what is the action of flexor pollicis brevis?

flexes MCP joint of thumb

8

which nerve innervates the hypothenars?

ulnar

9

which digit do the hypothenars act upon?

little finger - digit V

10

how many hypothenars are there?

3

11

name the 3 hypothenars

opponens digiti minimi
abductor digiti minimi
flexor digiti minimi brevis

12

what is the action of opponens digiti minimi?

opposition of little finger - rotates metacarpal V towards palm

13

what is the action of abductor digiti minimi?

abducts little finger

14

what is the action of flexor digiti minimi brevis?

flexes little finger at MCP

15

what is an important function of the lumbricals?

link the flexor and extensor tendons

16

how many lumbricals are there in the hand?

4

17

where do the lumbricals of the hand insert?

extensor hood of each digit

18

what is the action of the lumbricals?

flex at MCP and extend at IP

19

describe the innervation of the lumbricals of the hand

medial two digits = ulnar nerve
lateral two digits = median nerve

20

what is the general action of the interossei?

assist lumbricals in flexion at MCP and extension at IP

21

how many dorsal interossei are there?

4

22

how many palmar interossei are there?

3

23

what is the action of the dorsal interossei?

abduct fingers at MCP joint

24

what is the action of the palmar interossei?

adduct fingers at MCP joints

25

which nerve innervates all the interossei of the hand?

ulnar

26

where is palmaris brevis located?

superficially in the hypothenar eminence

27

what nerve innervates palmaris brevis?

ulnar

28

what is the action of palmaris brevis?

wrinkles skin of hypothenar eminence and deepens curvature of hand, improving grip

29

what is the action of adductor pollicis?

adducts thumb

30

which nerve innervates adductor pollicis?

ulnar