Hand - intrinsic muscles

Question 1

which nerve innervates the thenar muscles?

Answer 1

median

Question 2

what digit do the thenars act upon?

Answer 2

thumb (first digit)

Question 3

name the 3 thenar muscles

Answer 3

oppenens pollicis
abductor pollicis brevis
flexor pollicis brevis

Question 4

how many thenar muscles are there?

Answer 4

3

Question 5

what is the action of oppenens pollicis?

Answer 5

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

Question 6

what is the action of abductor pollicis brevis?

Answer 6

abducts thumb

Question 7

what is the action of flexor pollicis brevis?

Answer 7

flexes MCP joint of thumb

Question 8

which nerve innervates the hypothenars?

Answer 8

ulnar

Question 9

which digit do the hypothenars act upon?

Answer 9

little finger - digit V

Question 10

how many hypothenars are there?

Answer 10

3

Question 11

name the 3 hypothenars

Answer 11

opponens digiti minimi
abductor digiti minimi
flexor digiti minimi brevis

Question 12

what is the action of opponens digiti minimi?

Answer 12

opposition of little finger - rotates metacarpal V towards palm

Question 13

what is the action of abductor digiti minimi?

Answer 13

abducts little finger

Question 14

what is the action of flexor digiti minimi brevis?

Answer 14

flexes little finger at MCP

Question 15

what is an important function of the lumbricals?

Answer 15

link the flexor and extensor tendons

Question 16

how many lumbricals are there in the hand?

Answer 16

4

Question 17

where do the lumbricals of the hand insert?

Answer 17

extensor hood of each digit

Question 18

what is the action of the lumbricals?

Answer 18

flex at MCP and extend at IP

Question 19

describe the innervation of the lumbricals of the hand

Answer 19

medial two digits = ulnar nerve

lateral two digits = median nerve

Question 20

what is the general action of the interossei?

Answer 20

assist lumbricals in flexion at MCP and extension at IP

Question 21

how many dorsal interossei are there?

Answer 21

4

Question 22

how many palmar interossei are there?

Answer 22

3

Question 23

what is the action of the dorsal interossei?

Answer 23

abduct fingers at MCP joint

Question 24

what is the action of the palmar interossei?

Answer 24

adduct fingers at MCP joints

Question 25

which nerve innervates all the interossei of the hand?

Answer 25

ulnar

Question 26

where is palmaris brevis located?

Answer 26

superficially in the hypothenar eminence

Question 27

what nerve innervates palmaris brevis?

Answer 27

ulnar

Question 28

what is the action of palmaris brevis?

Answer 28

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

Question 29

what is the action of adductor pollicis?

Answer 29

adducts thumb

Question 30

which nerve innervates adductor pollicis?

Answer 30

ulnar