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MSK > Hand - intrinsic muscles > Flashcards

Hand - intrinsic muscles Flashcards

1
Q

which nerve innervates the thenar muscles?

A

median

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2
Q

what digit do the thenars act upon?

A

thumb (first digit)

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3
Q

name the 3 thenar muscles

A

oppenens pollicis
abductor pollicis brevis
flexor pollicis brevis

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4
Q

how many thenar muscles are there?

A

3

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5
Q

what is the action of oppenens pollicis?

A

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

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6
Q

what is the action of abductor pollicis brevis?

A

abducts thumb

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7
Q

what is the action of flexor pollicis brevis?

A

flexes MCP joint of thumb

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8
Q

which nerve innervates the hypothenars?

A

ulnar

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9
Q

which digit do the hypothenars act upon?

A

little finger - digit V

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10
Q

how many hypothenars are there?

A

3

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11
Q

name the 3 hypothenars

A

opponens digiti minimi
abductor digiti minimi
flexor digiti minimi brevis

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12
Q

what is the action of opponens digiti minimi?

A

opposition of little finger - rotates metacarpal V towards palm

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13
Q

what is the action of abductor digiti minimi?

A

abducts little finger

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14
Q

what is the action of flexor digiti minimi brevis?

A

flexes little finger at MCP

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15
Q

what is an important function of the lumbricals?

A

link the flexor and extensor tendons

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16
Q

how many lumbricals are there in the hand?

A

4

17
Q

where do the lumbricals of the hand insert?

A

extensor hood of each digit

18
Q

what is the action of the lumbricals?

A

flex at MCP and extend at IP

19
Q

describe the innervation of the lumbricals of the hand

A

medial two digits = ulnar nerve

lateral two digits = median nerve

20
Q

what is the general action of the interossei?

A

assist lumbricals in flexion at MCP and extension at IP

21
Q

how many dorsal interossei are there?

A

4

22
Q

how many palmar interossei are there?

A

3

23
Q

what is the action of the dorsal interossei?

A

abduct fingers at MCP joint

24
Q

what is the action of the palmar interossei?

A

adduct fingers at MCP joints

25
Q

which nerve innervates all the interossei of the hand?

A

ulnar

26
Q

where is palmaris brevis located?

A

superficially in the hypothenar eminence

27
Q

what nerve innervates palmaris brevis?

A

ulnar

28
Q

what is the action of palmaris brevis?

A

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

29
Q

what is the action of adductor pollicis?

A

adducts thumb

30
Q

which nerve innervates adductor pollicis?

A

ulnar

MSK (15 decks)

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