Muscles - Upper Extremity Flashcards

1
Q

Origin of Pectoralis Major

A

Clavicular Head - Medial Half of clavicle

Sternocostal Head - Manubrium and body of sternum, costal cartilage 2-6, aponeuroses of external oblique

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2
Q

Insertion of pectoralis major

A

Lateral lip of the intertubercular (bicipital) groove of humerus

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3
Q

Innervation of pectoralis major

A

Medial and lateral pectoral nerve

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4
Q

Action of pectoralis major

A

Flexes, adducts, and medially rotates the humerus

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5
Q

Origin of pectoralis minor

A

3rd, 4th, and 5th ribs

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6
Q

Insertion of pectoralis minor

A

Coracoid process of scapula

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7
Q

Innervation of pectoralis minor

A

Medial and lateral pectoral nerves

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8
Q

Action of pectoralis minor

A

Draws the scapula downward and forward, stabilizes it

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9
Q

Origin of the subclavius

A

First rib and first costal cartilage

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10
Q

Insertion of the sublcavius

A

inferior surface of the middle third of the clavicle

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11
Q

Innervation of subclavius

A

Nerve to the subclavius

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12
Q

Action of the subclavius

A

Depresses the lateral end of the clavicle, pulls the shoulder anteriorly, stabilizes the clavicle

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13
Q

Origin of the subscapularis

A

Subscapular fossa

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14
Q

Insertion of the subscapularis

A

Lesser tubercle of the humerus

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15
Q

Innervation of the subscapularis

A

Upper and lower subscapular nerves

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16
Q

Action of the subscapularis

A

Medially rotates the humerus

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17
Q

Origin of biceps brachii

A

Long head - Supraglenoid tubercle

Short head - Coracoid process of scapula

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18
Q

Insertion of biceps brachii

A

Radial tuberosity and bicipital aponeurosis

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19
Q

Innervation of biceps brachii

A

Musculocutaneous

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20
Q

Action of biceps brachii

A

Flexes and supinates forearm (most powerful supinator), weak flexor

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21
Q

Origin of the brachialis

A

Anterior surface of the lower half of humerus

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22
Q

Insertion of the brachialis

A

Ulnar tuberosity and coranoid process

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23
Q

Innervation of the brachialis

A

Musculocutaneous

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24
Q

Action of the brachialis

A

Chief flexor of the forearm

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25
Q

Origin of the coracobrachialis

A

Coracoid process of scapula

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26
Q

Insertion of the coracobrachialis

A

Medial humerus

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27
Q

Innervation of the coracobrachialis

A

Musculocutaneous

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28
Q

Action of the coracobrachialis

A

Flexes and adducts humerus

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29
Q

Origin of the triceps brachii

A

Long head - infraglenoid tubercle of scapula
Lateral head - posterior humerus above radial groove
Medial head - posterior humerus below radial groove

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30
Q

Insertion of triceps brachii

A

Olecranon process of ulna

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31
Q

Innervation of triceps brachii

A

Radial

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32
Q

Action of triceps brachii

A

Chief extensor of arm

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33
Q

Origin of anconeus

A

Lateral epicondyle of the humerus

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34
Q

Insertion of anconeus

A

Olecranon process of the ulna

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35
Q

Innervation of the anconeus

A

Radial nerve

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36
Q

Action of the anconeus

A

Extension of the forearm

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37
Q

Origin of the pronator teres

A

Humeral head - medial epicondyle of humerus (common flexor tendon)
Ulnar head - Coronoid process of ulna

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38
Q

Insertion of the pronator teres

A

Lateral side of radius

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39
Q

Innvervation of pronator teres

A

Median nerve

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40
Q

Action of the pronator teres

A

Pronation and flexion of forearm

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41
Q

Origin of the flexor carpi radialis

A

Medial epicondyle of humerus (common flexor tendon)

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42
Q

Insertion of flexor carpi radialis

A

Bases of second and third metacarpals

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43
Q

Innvervation of flexor carpi radialis

A

Median nerve

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44
Q

Action of flexor carpi radialis

A

Flexes and abducts the wrist joint

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45
Q

Origin of palmaris longus

A

Medial epicondyle of humerus (common flexor tendon)

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46
Q

Insertion of palmaris longus

A

flexor retinaculum and palmar aponeurosis

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47
Q

Innvervation of palmaris longus

A

Median nerve

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48
Q

Action of palmaris longus

A

Flexes wrist

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49
Q

Origin of flexor carpi ulnaris

A

Humeral head - medial epicondyle of the humerus (common flexor tendon)
Ulnar head - olecranon process of ulna

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50
Q

Insertion of flexor carpi ulnaris

A

Pisisform, hook of hamate, base of fifth metacarpal

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51
Q

Innvervation of flexor carpi ulnaris

A

Ulnar nerve

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52
Q

Action of flexor carpi ulnaris

A

Flexes and adducts wrist

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53
Q

Origin of flexor digitorum superficialis

A

Humeroulnar head - medial epicondyle of humerus (common flexor tendon), olecranon process of ulna
Radial head- anterior radius

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54
Q

Insertion of flexor digitorum superficialis

A

Middle phalanges of medial four digits

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55
Q

Innvervation of flexor digitorum superficialis

A

Median nerve

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56
Q

Action of flexor digitorum superficialis

A

Flexes fingers, knuckles, wrist

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57
Q

Origin of flexor pollicus longus

A

Anterior radius

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58
Q

Insertion of flexor pollicus longus

A

Distal phalanx of thumb

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59
Q

Innervation of flexor policus longus

A

Anterior interosseous branch of median nerve

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60
Q

Action of flexor pollicus longus

A

Flexes thumb

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61
Q

Origin of flexor digitorum profundus

A

Anteromedial ulna

62
Q

Insertion of flexor digitorum profundus

A

Distal phalanges of medial four digits

63
Q

Innervation of flexor digitorum profundus

A

Ulnar and median nerves (anterior interosseous branch)

64
Q

Action of flexor digitorum profundus

A

Flexes fingers, knuckles, and wrist

65
Q

Origin of pronator quadratus

A

Anterior ulna

66
Q

Insertion of pronator quadratis

A

Anterior radius

67
Q

Innervation of pronator quadratis

A

Anterior interosseous branch of median nerve

68
Q

Action of pronator quadratis

A

Pronates the forarm

69
Q

Origin of brachioradialis

A

Lateral supracondylar ridge of humerus

70
Q

Insertion of brachioradialis

A

Styloid process of radius

71
Q

Innervation of brachioradialis

A

Radial nerve

72
Q

Action of brachioradialis

A

Flexes forearm

73
Q

Origin of extensor carpi radialis longus

A

Lateral supracondylar ridge of humerus

74
Q

Insertion of extensor carpi radialis longus

A

Base of second metacarpal bone

75
Q

Innervation of extensor carpi radialis longus

A

Radial nerve

76
Q

Action of extensor carpi radialis longus

A

Extends and abducts hand at wrist joint

77
Q

Origin of extensor carpi radialis brevis

A

Lateral epicondyle of humerus (common extensor tendon)

78
Q

Insertion of extensor carpi radialis brevis

A

Base of third metacapal bone

79
Q

Innervation of extensor carpi radialis brevis

A

Deep branch of radial nerve

80
Q

Action of extensor carpi radialis brevis

A

Extends and abducts hand at wrist joint

81
Q

Origin of extensor digitorum

A

Lateral epicondyle of humerus (common extensor tendon)

82
Q

Insertion of extensor digitorum

A

Extensor expansions of medial four digits

83
Q

Innervation of extensor digitorum

A

Posterior interosseous branch of radial nerve

84
Q

Action of extensor digitorum

A

Extends fingers, knuckles, and hand at wrist joint

85
Q

Origin of extensor digiti minimi

A

Lateral epicondyle of humerus (common extensor tendon)

86
Q

Insertion of extensor digiti minimi

A

Extensor expansion of little finger

87
Q

Innervation of extensor digiti minimi

A

Posterior interosseous branch of radial nerve

88
Q

Action of extensor digiti minimi

A

Extends little finger

89
Q

Origin of extensor carpi ulnaris

A

Lateral epicondyle of humerus (common extensor tendon)

90
Q

Insertion of extensor carpi ulnaris

A

Base of fifth metacarpal

91
Q

Innervation of extensor carpi ulnaris

A

Posterior interosseous branch of radial nerve

92
Q

Action of extensor carpi ulnaris

A

Extends and adducts hand at wrist joint

93
Q

Origin of supinator

A

Lateral epicondyle of humerus (common extensor tendon), anular ligament of proximal radioulnar joint

94
Q

Insertion of supinator

A

Neck and shaft of radius

95
Q

Innervation of supinator

A

Deep branch of radial nerve

96
Q

Action of supinator

A

Supinates forearm

97
Q

Origin of abductor pollicis longus

A

Radius and ulna

98
Q

Insertion of abductor pollicis longus

A

Base of first metacarpal

99
Q

Innervation of abductor pollicis longus

A

Posterior interosseous branch of radial nerve

100
Q

Action of abductor pollicis longus

A

Abducts and extends thumb

101
Q

Origin of extensor pollicis brevis

A

Radius

102
Q

Insertion of extensor pollicis brevis

A

Base of proximal phalanx of thumb

103
Q

Innervation of extensor pollicis brevis

A

Posterior interosseous branch of radial nerve

104
Q

Action of extensor pollicis brevis

A

Extends thumb, knuckle, and wrist

105
Q

Origin of extensor pollicis longus

A

Ulna

106
Q

Insertion of extensor pollicis longus

A

Base of distal phalanx of thumb

107
Q

Innervation of extensor pollicis longus

A

Posterior interosseous branch of radial nerve

108
Q

Action of extensor pollicis longus

A

Extends thumb, knuckle, and wrist

109
Q

Origin of extensor indicis

A

Ulna

110
Q

Insertion of extensor indicis

A

Extensor expansion of index finger

111
Q

Innervation of extensor indicis

A

Posterior interosseous branch of radial nerve

112
Q

Action of extensor indicis

A

Extends index finger, knuckle, and wrist

113
Q

Origin of abductor pollicis brevis

A

Flexor retinaculum

114
Q

Insertion of abductor pollicis brevis

A

Lateral side of base of proximal phalanx with the flexor pollicis brevis

115
Q

Innervation of the abductor pollicis brevis

A

Recurrent branch of the median nerve

116
Q

Action of the abductor pollicis brevis

A

Abducts the thumb

117
Q

Origin of the flexor pollicis brevis

A

Flexor retinaculum

118
Q

Insertion of the flexor pollicis brevis

A

Lateral side of base of proximal phalanx with the abductor pollicis brevis

119
Q

Innervation of the flexor pollicis brevis

A

Recurrent branch of median nerve

120
Q

Action of the flexor pollicis brevis

A

Flexes thumb

121
Q

Origin of opponens pollicis

A

Flexor retinaculum

122
Q

Insertion of opponens pollicis

A

Whole longth of lateral border of 1st metacarpal bone

123
Q

Innervation of opponens pollicis

A

Recurrent branch of median nerve

124
Q

Action of opponens pollicis

A

Opposes thumb

125
Q

Origin of adductor pollicis

A

Oblique head - Second and third metacarpal bones

Transverse head - Third metacarpal bone

126
Q

Insertion of adductor pollcis

A

Base of proximal phalanx of thumb

127
Q

Innervation of adductor pollicis

A

Deep branch of ulnar nerve

128
Q

Action of adductor pollicis

A

Adducts the thumb

129
Q

Origin of abductor digiti minimi

A

Flexor retinaculum

130
Q

Insertion of abductor digiti minimi

A

Medial side of base of proximal phalanx of the little finger

131
Q

Innervation of abductor digiti minimi

A

Deep branch of ulnar nerve

132
Q

Action of abductor digiti minimi

A

Abducts the little finger

133
Q

Origin of flexor digiti minimi

A

Flexor retinaculum

134
Q

Insertion of flexor digiti minimi

A

Medial side of base of proximal phalanx of the little finger

135
Q

Innervation of flexor digiti minimi

A

Deep branch of ulnar nerve

136
Q

Action of flexor digiti minimi

A

Flexes the little finger

137
Q

Origin of opponens digiti minimi

A

Flexor retinaculum

138
Q

Insertion of opponens digiti minimi

A

Whole length of the medial border of the 5th metacarpal bone

139
Q

Innervation of opponens digiti minimi

A

Deep branch of ulnar nerve

140
Q

Action of opponens digiti minimi

A

Opposes the little finger and deepens the palm

141
Q

Origin of lumbricals

A

Tendons of the flexor digitorum profundus

142
Q

Insertion of the lumbricals

A

Lateral sides of the extensor expansions distal to the knuckle joints

143
Q

Innervation of the lumbricals

A

First and second - median nerve

Third and fourth - ulnar nerve

144
Q

Action of the lumbricals

A

Flexes metacarpophalangeal joints (knuckles) and extends the interphalangeal joints

145
Q

Origin of palmar interosseous muscles

A

Second, fourth, and fifth metacarpals

146
Q

Insertion of palmar interosseous muscles

A

Dorsal extensor expansions beyond knuckle joint

147
Q

Innervation of palmar interosseous muscles

A

Deep branch of ulnar nerve

148
Q

Action of palmar interosseous muscle

A

Flex metacarpophalangeal joints, extend interphalangeal joints, adduct fingers toward center of middle finger (palmar adduct = PAD)

149
Q

Origin of dorsal interosseous muscles

A

Contiguous sides of shafts of metacarpal bones

150
Q

Insertion of dorsal interosseous muscles

A

Dorsal extensor expansion

151
Q

Innervation of dorsal interosseous muscles

A

Deep branch of ulnar nerve

152
Q

Action of dorsal interosseous muscles

A

Flex metacarpophalangeal joints, extend interphalangeal joints, abduct fingers from center of third finger (Dorsal abduct = DAB)