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MSK 8 Flashcards

1
Q

all posterior forearm compartment muscles are innervated by what?

A

radial nerve

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2
Q

what is the origin of the brachioradialis?

A

proximal 2/3 of lateral supracondylar ridge of huemrus

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3
Q

what is the insertion of the brachioradialis?

A

lateral surface of distal end of radius proximal to styloid process

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4
Q

what is the function of the brachioradialis?

A

flexion of the forearm

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5
Q

what is the innervation of the brachioradialis?

A

radial nerve

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6
Q

what is the origin of extensor carpi radialis longus?

A

distal 1/3 of lateral supracondylar ridge of humerus

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7
Q

what is the insertion of the extensor carpi radialis longus?

A

base of 2nd metacarpal bone

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8
Q

what are the functions of the extensor carpi radialis longus?

A
  1. extension of hand at wrist
  2. radial deviation (abduction) of wrist
  3. flexion of elbow (weak)
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9
Q

what is the innervation of the extensor carpi radialis longus?

A

radial nerve

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10
Q

what is the origin of the extensor carpi radialis brevis?

A

lateral epicondyle of humerus

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11
Q

what is the insertion of the extensor carpi radialis brevis?

A

base of 3rd metacarpal bone

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12
Q

what are the functions of the extensor carpi radialis brevis?

A
  1. extension of hand at wrist
  2. radial deviation (abduction) of wrist
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13
Q

what is the innervation of the extensor carpi radialis brevis?

A

radial nerve

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14
Q

what does the mobile wad of 3 consist of?

A

brachioradialis, extensor carpi radialis longus, extensor carpi radialis brevis

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15
Q

what is the origin of the extensor digitorum?

A

lateral epicondyle of humerus (via common extensor tendon)

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16
Q

what is the insertion of the extensor digitorum?

A

distal and middle phalanges of fingers #2-5

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17
Q

what are the functions of the extensor digitorum?

A
  1. extension of fingers 2-5
  2. extension of hand at wrist
  3. extension of elbow (weak)
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18
Q

what is the innervation of the extensor digitorum?

A

radial nerve

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19
Q

what is the origin of the extensor digiti minimi

A

lateral epicondyle of humerus (via common extensor tendon)

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20
Q

what is the insertion of the extensor digiti minimi

A

middle and distal phalanges of little finger

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21
Q

what are the functions of the extensor digiti minimi?

A
  1. extension of finger 5 at MCP, PIP, and DIP joints
  2. extension of hand at wrist
  3. extension of elbow (weak)
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22
Q

what is the innervation of the extensor digit minimi?

A

radial nerve

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23
Q

what is the dorsal digital expansion (extensor hood)

A

triangular tendinous aponeurosis that wrap around the metacarpophalangeal joints and extend along the proximal and middle phalanges across 2 interphalangeal joints to attach to the distal phalanx

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24
Q

what is the origin of the extensor carpi ulnaris?

A

lateral epicondyles of humerus (via common extensor tendon) and posterior border of ulna

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25
Q

what is the insertion of the extensor carpi ulnaris?

A

base of 5th metacarpal bone

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26
Q

what are the functions of the extensor carpi ulnaris?

A
  1. extension of hand at wrist
  2. ulnar deviation (adduction of the wrist)
    3.extension of elbow (weak)
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27
Q

what is the innervation of extensor carpi ulnaris?

A

radial nerve

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28
Q

what is the origin of anconeus?

A

lateral epicondyle of humerus

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29
Q

what is the insertion o anconeus?

A
  • olecranon process of ulna
  • proximal of posterior surface of ulna
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30
Q

what is the function of anconeus?

A

extension of forearm of elbow (weak)

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31
Q

what is the innervation of the anconeus?

A

radial nerve

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32
Q

what is the origin of the supinator

A
  1. supinator crest of ulna
  2. lateral epicondyle of humerus
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33
Q

what is the insertion of the supinator

A

proximal 1/3 of lateral surface of radius

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34
Q

what is the function of supinator?

A

supination of the forearm

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35
Q

what is the innervation of the supinator?

A

radial nerve

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36
Q

what is the origin of the abductor pollicis longus?

A

the middle of posterior surface of radius, ulna, and interosseous membrane

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37
Q

what is the insertion of the abductor pollicis longus

A

the base of the 1st metacarpal

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38
Q

what are the functions of the abductor pollicis longus?

A
  1. abduction of the thumb of carpometacarpal joint
  2. extension of thumb at carpometacarpal joint
  3. radial deviation of hand at wrist
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39
Q

what is the innervation of the abductor pollicis longus?

A

radial nerve

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40
Q

what is the origin of extensor pollicis brevis?

A

distal 1/3 of posterior surface of radius and interosseous membrane

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41
Q

what is the insertion of extensor pollicis brevis?

A

base of proximal phalanx of thumb

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42
Q

what are the functions of the extensor pollicis brevis?

A
  1. extension of thumb at CMC and MCP joint
  2. extension of hand at wrist
  3. radial deviation (abduction) of hand (weak)
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43
Q

what is the innervation of extensor pollicis brevis?

A

radial nerve

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44
Q

what is the origin of extensor pollicis longus?

A

middle 1/3 of posterior surface of ulna and interosseous membrane

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45
Q

what is the insertion of extensor pollicis longus?

A

base of distal phalanx of thumb

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46
Q

what are the functions of extensor pollicis longus?

A
  1. extension of thumb at all joints
  2. extension of hand at wrist
  3. radial deviation
47
Q

what is the innervation of extensor pollicis longus?

A

radial nerve

48
Q

what is the origin of extensor indicis?

A

distal 1/3 of posterior surface of ulna and interosseous membrane

49
Q

what is the insertion of extensor indicis?

A

dorsal digital expansion of the 2nd finger

50
Q

what are the functions of extensor indicis?

A
  1. extension of digit 2 at MCP and interphalangeal joints
  2. extension of hand at wrist
51
Q

what is the innervation of extensor indicis?

A

radial nerve

52
Q

what are the borders of the anatomical snuff box?

A

lateral border: abductor pollicis longus and extensor pollicis brevis
medial border: extensor pollicis longus

53
Q

what artery passes through the anatomical snuff box?

A

radial artery

54
Q

what is medial epicondylitis (golf elbow)?

A

tenderness and pain at the medial epicondyle, made worse by flexing the wrist

55
Q

what is lateral epicondylitis (tennis elbow)

A

when the common extensor tendon becomes painful and tender and pain at the lateral epicondyle

56
Q

the hand is composed of 3 parts…

A
  • wrist
  • hand proper
  • fingers
57
Q

explain palmar aponeurosis

A

comes from the palmaris longus, fascia on the palm of the hand, and protects the soft tissues underneath

58
Q

what are the 3 intrinsic groups of muscles of the hand?

A
  1. thenar group
  2. hypothenar group
  3. central
59
Q

what are the 3 muscles of the thenar group?

A

abductor pollicis brevis, flexor pollicis brevis, and opponens pollicis

60
Q

what are the origins of the abductor pollicis brevis?

A
  • flexor retinaculum
  • tubercle of scaphoid
  • tubercle of trapezium
61
Q

what is the insertion of the abductor pollicis brevis?

A

lateral side of the base of proximal phalanx of thumb

62
Q

what is the function of the abductor pollicis brevis?

A

abduction of the thumb

63
Q

what is the innervation of the abductor pollicis brevis?

A

median nerve

64
Q

what are the origins of flexor pollicis brevis?

A

flexor retinaculum and trapezium

65
Q

what is the insertion of the flexor pollicis brevis?

A

lateral side of the base of proximal phalanx of thumb

66
Q

what is the function of the flexor pollicis brevis?

A

flexion of thumb

67
Q

what is the innervation of flexor pollicis brevis?

A

median nerve

68
Q

what are the origin of opponens pollicis?

A

flexor retinaculum and trapezium

69
Q

what is the insertion of the opponens pollicis

A

1st metacarpal bone

70
Q

what is the function of the opponens pollicis?

A

opposition of thumb

71
Q

what is the innervation of the opponens pollicis?

A

median nerve

72
Q

what are the muscles of the hypothenar group?

A

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

73
Q

what is the origin of palmaris brevis?

A

palmar aponeurosis

74
Q

what is the insertion of palmaris brevis?

A

skin of the medial side of the hand

75
Q

what is the function of palmaris brevis?

A

wrinkles the skin

76
Q

what is the innervation of the palmaris brevis?

A

ulnar nerve

77
Q

what is the origin of the abductor digiti minimi?

78
Q

what is the insertion of the abductor digiti minimi?

A

medial side of proximal phalanx of little finger or 5th digits

79
Q

what is the function of the abductor digiti minimi?

A

abduction of the little finger

80
Q

what is the innervation of the abductor digiti minimi?

A

ulnar nerve

81
Q

what are the origins of the flexor digiti minimi brevis?

A

flexor retinaculum and hook of hamate

82
Q

what is the insertion of the flexor digiti minimi brevis?

A

medial side of the base of proximal phalanx of 5th finger

83
Q

what is the function of the flexor digiti minimi brevis?

A

flexion of the little finger

84
Q

what is the inenrvation of the flexor digiti minimi brevis?

A

ulnar nerve

85
Q

what are the origins of the opponens digiti minimi?

A

flexor retinaculum and hook of hamate

86
Q

what is the insertion of the opponens digiti minimi?

A

5th metacarpal bone

87
Q

what is the function of opponens digiti minimi?

A

opposition of the 5th finger

88
Q

what is the innervation of the opponens digiti minimi?

A

ulnar nerve

89
Q

what are the muscles of the central group?

A

adductor pollicis, lumbrical muscles, and dorsal interosseous muscles

90
Q

what are the origins of the adductor pollicis?

A

oblique head:
- base of 2nd and 3rd metacarpal bones
- capitate
transverse head:
- anterior surface of 3rd metacarpal bone

91
Q

what are the insertion of the adductor pollicis?

A

both heads: medial side of the base of proximal phalanx of thumb

92
Q

what is the function of the adductor pollicis?

A

adduction of the thumb

93
Q

what is the innervation of the adductor pollicis?

A

ulnar nerve

94
Q

what is the origin of the lumbrical muscles?

A

tendon of the flexor digitorum profundus of each finger

95
Q

what is the insertion of the lumbrical muscles

A

dorsal digital expansion of 4 medial fingers

96
Q

lumbrical #1 inserts:

A

into the dorsal digital expansion of the index finger

97
Q

lumbrical #2 inserts:

A

into the dorsal digital expansion of the middle finger

98
Q

lumbrical #3 inserts:

A

into the dorsal digital expansion of the ring finger

99
Q

lumbrical #4 inserts:

A

into the dorsal digiti expansion of the little finger

100
Q

what are the functions of the lumbrical muscles?

A
  1. flexion of fingers #2-5 at MCP joints
  2. extension of fingers #2-5 at PIP and DIP joints
101
Q

what are the innervation of the lumbrical muscles?

A

median nerve for #1 and 2
ulnar nerve for #3 and 4

102
Q

what is the origin of the dorsal interosseous muscles?

A

adjacent sides of metacarpals

103
Q

what is the insertion of the dorsal interosseous muscles?

A

base of proximal phalanges and dorsal digital expansion of fingers (#2,3,4)

104
Q

the dorsal interosseous #1 inserts…

A

to the lateral side of the index finger

105
Q

the dorsal interosseous #2 inserts…

A

to the lateral side of the middle finger

106
Q

the dorsal interosseous #3 inserts…

A

to the medial side of the medial finger

107
Q

the dorsal interosseous #4 inserts…

A

to the medial side of the ring finger

108
Q

what are the functions fo the dorsal interosseous muscles?

A
  • abduction of the fingers #2,3,4 @ MCP joints
  • flexion of fingers #2,3,4 @ MCP joints
  • extension of fingers #2,3,4 @ IP joints (PIP and DIP)
109
Q

what is the innervation of the dorsal interosseous muscles

A

ulnar nerve

110
Q

what are the origins of the palmar interosseous muscles?

A

anterior side of metacarpal of fingers #2,4,5
- palmar interosseous #1: metacarpal #2
- palmar interosseous #2: metacarpal #4
- palmar interosseous #3: metacarpal #5

111
Q

what is the insertion of the palmar interosseous muscles?

A

base of proximal phalanges and dorsal digital expansion of fingers (2,4,5)
- palmar interosseous #1 to the index finger
- palmar interosseous #2 to the lateral ring finger
- palmar interosseous #3 to the little finger

112
Q

what are the functions of the palmar interosseous muscles?

A
  • adduction of the fingers #2,4, and 5 @ MCP joints “PAD”
  • flexion of fingers #2,4, and 5 @ MCP joint
  • extension of fingers #2,4,and 5 @ IP joints (pip and dip)
113
Q

what is the innervation of the palmar interosseous muscles?

A

ulnar nerve

MSK test 2 (6 decks)

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