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MSAK-1 > Intrinsic Mucscles of the Hand > Flashcards

Intrinsic Mucscles of the Hand Flashcards

1
Q

What are the three parts of the hand?

A
  1. the wrist (carpus) 2. hand proper (metacarpus) 3. fingers (digits)
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2
Q

The anterior surface of the hand is called what?

A

the palm

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3
Q

What posterior surface of the hand is called what?

A

dorsum

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4
Q

What is the axis of the hand?

A

the third metacarpal (middle finger)

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5
Q

ADDuction and ABduction of fingers is in relation to what?

A

the axis (middle finger) of the hand

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6
Q

What are the movements of the axis of the hand?

A

ABduction to the right and left (no adduction because it is the axis)

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7
Q

What is different about the first digit (thumb) compared to digits 2-5?

A

2 phalanges, has 90 degree medial rotation

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8
Q

What digit is at a right angle to the other digits?

A

first

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9
Q

What are the movements of the thumb? At what joint?

A

AB/ADD, flex/ext/opposition, reposition @ carpometacarpal joints

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10
Q

What is the carpal arch?

A

formed by carpal bones, directed anteriorly

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11
Q

How is the carpal tunnel formed?

A

carpal arch being converted to carpal tunnel by the attachment of the flexor retinaculum

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12
Q

What passes through the carpal tunnel?

A

9 tendons and median nerve

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13
Q

What are the 9 tendons that pass through the carpal tunnel?

A

x4 from flexor digitortorum superficialis
x4 from flexor digitorum profundus
x1 from flexor pollicis longus

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14
Q

What is an extrinsic muscle?

A

origin and insertion are not in the same region

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15
Q

What is an intrinsic muscle?

A

origin and insertion are in the same region

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16
Q

What are the groups of intrinsic muscles of the hand?

A

Thenar Eminence, Hypothenar Eminence, Central

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17
Q

What is the thenar eminence?

A

intrinsic muscles of the hand that move the thumb.

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18
Q

What muscles are part of the thenar eminence?

A

abductor pollicis brevis, flexor pollicis brevis, opponens pollicis

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19
Q

What is the deepest muscle of the thenar eminence

A

opponens pollicis

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20
Q

What is the hypothenar eminence

A

intrinsic muscles of the hand that move the 5th digit

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21
Q

What muscles are included in the hypothenar eminance?

A

palmaris brevis, abductor digiti minimi, flexor digiti minimi, opponens digiti minimi

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22
Q

What muscles are included in the central group of the hand?

A

lumbricals (4), dorsal interosseous (4), palmar interosseous (3), adductor pollicis

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23
Q

Which of the follow muscles does NOT belong to the thenar eminence? What group does it actually belong to?:
Abductor pollicis brevis, adductor pollicis, flexor pollicis brevis, opponens pollicis

A

Adductor Pollicis belongs to central group

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24
Q

All intrinsic muscles of the hand are innervated by which nerve(s)?

A

medial and/or ulnar

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25
Q

Lumbrical muscles are innervated by which nerve(s)

A

median and/or ulnar

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26
Q

The thenar eminence is innervated by which nerve(s)

A

median nerve

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27
Q

The hypothenar eminence is innervated by which nerve(s)

A

ulnar nerve

28
Q

What is the origin of the abductor pollicis brevis?

A

flexor retinaculum and scaphoid + trapezium

29
Q

What is the insertion of the abductor pollicis brevis

A

proximal phalanx of the first digit (thumb)

30
Q

What are the functions of the abductor pollicis brevis?

A

abduction of the thumb @ CMC + MCP

31
Q

What is the innervation of the abductor pollicis brevis

A

median nerve

32
Q

What muscle group is the abductor pollicis brevis part of

A

Thenar Eminence

33
Q

What is the origin of the flexor pollicis brevis?

A

flexor retinaculum and trapezium

34
Q

What is the insertion of the flexor pollicis brevis?

A

proximal phalanx of first digit (thumb)

35
Q

What are the functions of the flexor pollicis brevis

A

flexion of first digit (thumb) @ CMC + MCP

36
Q

What is the innervation of the flexor pollicis brevis?

A

median (and ulnar)

37
Q

What muscle group does the flexor pollicis brevis belong to?

A

thenar eminence

38
Q

What is the origin of the abductor digiti minimi

A

pisiform and tendon of FCU

39
Q

What is the insertion of the abductor digiti minimi?

A

proximal phalanx of 5th finger

40
Q

What are the functions of the abductor digiti minimi?

A

abduction of the 5th digit @ CMC and MCP

41
Q

What is the innervation of the abductor digiti minimi?

A

ulnar nerve

42
Q

What muscle group does the abductor digiti minimi belong to?

A

Hypothenar eminence

43
Q

What is the origin of the flexor digiti minimi brevis manus?

A

flexor retinaculum and hook of hamete

44
Q

What is the insertion of the flexor digiti minimi brevis manus?

A

proximal phalanx of 5th digit

45
Q

What are the functions of the flexor digiti minimi brevis manus?

A

flexion of the 5th digit @ CMC + MCP

46
Q

What is the innervation of the flexor digiti minimi brevis manus?

A

ulnar nerve

47
Q

What muscle group does the flexor digiti minimi brevis manus belong to?

A

hypothenar eminence

48
Q

What group of interosseous muscles is ‘not real’ interosseous muscles?

A

palmar interosseous

49
Q

What group of interosseous muscles are ‘real’ interosseous muscles? Why?

A

dorsal interossi muscles, they are truly inbetween metacarpal bones

50
Q

Generally what is the origin of the palmar interossei muscles?

A

anterior side of metacarpals of fingers #2,4,5

51
Q

What is the origin of the palmar interosseous #1?

A

metacarpal #2

52
Q

What is the origin of the palmar interosseous #2

A

metacarpal #4

53
Q

What is the origin of palmar interosseous #3

A

metacarpal #5

54
Q

Generally what is the insertion of the palmar interossei muscles?

A

base of proximal phalanges and extensor hoods of fingers 2,4,5

55
Q

What is the insertion of palmar interoseous #1?

A

to index (#2)

56
Q

What is the insertion of the palmar interosseous #2?

A

to lateral ring finger (#4)

57
Q

What is the insertion of palmar interosseous #3?

A

to pinkie (#5)

58
Q

What are the functions of the palmar interossei muscles?

A

ADDuction of fingers 2,4,5 @ MCP,
Flexion of fingers 2,4,5 @ MCP
Extension of fingers 2,4,5 @ PIP+DIP

59
Q

What nerve innervates the palmar interossei muscles

A

ulnar nerve

60
Q

What is the origin of the dorsal interossi muscles?

A

adjacent sides of metacarpals

61
Q

Generally what is the insertions of the dorsal interossi muscles?

A

base of proximal phalanges and extensor hoods of fingers 2,3,4

62
Q

What is the insertion of dorsal interosseous #1?

A

lateral side of index (#2)

63
Q

What is the insertion of dorsal interosseous #2?

A

lateral side of middle (#3)

64
Q

What is the insertion of dorsal interosseous #3?

A

medial side of middle (3)

65
Q

What is the insertion of dorsal interosseous #4?

A

medial side of ring (#4)

66
Q

What are the functions of the dorsal interossi muscles?

A

Abduction of fingers 2,3,4 @ MCP, Flexion of fingers 2,3,4 @MCP, Extension of fingers 2,3,4 @ PIP+DIP

67
Q

What is the innervation of the dorsal interossi muscles?

A

ulnar nerve

MSAK-1 (19 decks)

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