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LRH MSK Exam 2 > Muscles > Flashcards

Muscles Flashcards

1
Q

Trapezius innervation

A

Motor: accessory nerve

Also receives proprioceptor fibers from C3 and C4 spinal nerves

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2
Q

Trapezius origin

A

Medial 1/3 of superior nuchal line (on skull), external occipital protuberance (also on skull), nuchal ligament, spinous processes of C7-T12

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3
Q

Trapezius attachment

A

Lateral 3rd clavicle, acromium and scapular spine

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4
Q

List Trapezius actions on __________:

A

On scapula*

Elevation/depression

Protraction/retraction

Upward rotation/downward rotation

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5
Q

Latissimus dorsi innervation

A

Thoracodosal nerve (C6-C8)

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6
Q

Latissimus Dorsi origin

A

Spinous processes T7-12, thoracolumbar fascia, iliac crest, inferior 3-4 ribs

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7
Q

Latissimus Dorsi insertion

A

Floor of intertubercular sulcus of humerus

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8
Q

Latissimus Dorsi actions

A

Extends humerus

Adductor humerus

Medially rotates humerus

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9
Q

Levator scapulae innervation

A

Dorsal scapular nerve (C5) and cervical spinal nerves (C3, C4)

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10
Q

Levator Scapulae origin

A

Transverse processes of C1-C4

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11
Q

Levator Scapulae insertion

A

Medial superior scapula

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12
Q

Levator scapulae action

A

Elevates scapula and rotates it downward

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13
Q

Rhomboid minor innervation

A

Dorsal scapular nerve

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14
Q

Rhomboid minor origin

A

Nuchal ligament, C7-T1 spinous processes

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15
Q

Rhomboid minor insertion

A

Medial scapula at spine border

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16
Q

Rhomboid major innervation

A

Dorsal scapular nerve

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17
Q

Rhomboid major origin

A

Spinous processes T2-T5

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18
Q

Rhomboid major insertion

A

Medial scapular border

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19
Q

Rhomboid major and minor action

A

Elevates scapula

Retracts scapula

Rotates scapula downward

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20
Q

Supraspinatus innervation

A

Supraspinatus nerve

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21
Q

Supraspinatus origin

A

Supraspinous fossa of the scapula

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22
Q

Supraspinatus attachment

A

Greater tubercle of the humerus

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23
Q

Supraspinatus action

A

Stabilizes the glenohumeral joint

Abducts the arm 0-15 degrees, and assists the deltoid for 15-90 degrees

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24
Q

Infraspinatous innervation

A

Suprascapular nerve

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25
Q

Infraspinatus origin

A

Infraspinous fossa of the scapula

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26
Q

Infraspinatus insertion

A

Greater tubercle of the humerus

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27
Q

Infraspinatus action

A

Stabilizes the glenohumeral joint

Laterally rotates the arm

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28
Q

Subscapularis innervation

A

Upper and lower subscapular nerve

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29
Q

Subscapularis origin

A

Subscapular fossa, costal surface of the scapula

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30
Q

Subscapularis insertion

A

Lesser tubercle of the humerus

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31
Q

Subscapularis action

A

Stabilizes the glenohumeral joint

Medially rotates the arm

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32
Q

Teres minor innervation

A

Axillary nerve

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33
Q

Teres minor origin

A

Posterior surface of the scapula adjacent to itslateral border

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34
Q

Teres minor insertion

A

Greater tubercle of the humerus

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35
Q

Teres minor action

A

Stabilizes the glenohumeral joint

Laterally rotates the arm

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36
Q

Serratus posterior superior muscle innervation

A

Intercostal nerves

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37
Q

Serratus posterior superior muscle origin

A

Lower part of the ligamentum nuchae and the cervical and thoracic spines (C7-T3)

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38
Q

Serratus Posterior Superior muscle insertion

A

Ribs 2-5

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39
Q

Serratus posterior superior action

A

Elevates ribs 2-5

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40
Q

Serratus posterior inferior muscle innervation

A

Intercostal nerves

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41
Q

Serratus posterior inferior muscle origin

A

Thoracic and lumbar spines (T11-L3)

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42
Q

Serratus posterior inferior muscle insertion

A

Ribs 9-12

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43
Q

Serratus posterior inferior muscle action

A

Depresses ribs 9-12

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44
Q

Splenius capitis innervation

A

Posterior rami of spinal nerves C3 and C4

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45
Q

Splenius capitis origin

A

Lower aspect of the ligamentum nuchae and the spinous processes of C7-T3/4 vertebrae

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46
Q

Splenius capitis insertion

A

Mastoid process and the occipital bone of the skull

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47
Q

Splenius capitis action

A

Rotate head to the same side

Also acts with splenius cervicis to extend the head and neck

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48
Q

Splenius cervicis innervation

A

Posterior rami of the lower cervical spinal nerves

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49
Q

Splenius cervicis origin

A

Spinous processes of T3-T-6 vertebrae

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50
Q

Splenius cervicis insertion

A

Transverse processes of C1-3/4

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51
Q

Splenius cervicis action

A

Rotate the head to the same side

Also acts with the splenius capitis to extend the head and neck

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52
Q

Muscles included in the erector spinae

A

Iliocostalis m, longissimus m, and spinalis m

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53
Q

Common origin of erector spinae muscles

A

Common tendinous origin that arises from:

Lumbar and lower thoracic vertebrae, sacrum, posterior aspect of iliac crest, sacroiliac and supraspinous ligaments

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54
Q

Erector spinae (I,L,S) muscle innervation

A

Posterior rami of the spinal nerves

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55
Q

Iliocostalis muscle insertion

A

Costal angle of the ribs and the cervical transverse processes

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56
Q

Longissimus muscle insertion

A

Lower ribs, the transverse processes of C2-T12 and the mastoid process of the skull

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57
Q

Semispinalis muscle insertion

A

Spinous processes of C2-T4 and to the occipital bone of the skull

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58
Q

Action of the erector spinae muscles

A

Unilaterally - act to laterally flex the vertebral column

Bilaterally - act to extend the vertebral column and head

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59
Q

Multifidus muscle innervation

A

Posterior rami of the spinal nerves

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60
Q

Multifidus muscle origin

A

Broad origin - sacrum, posterior iliac spine, common tendinous origin of the erector spinae, mamillary processes of lumbar vertebrae, transverse processes of C4-C7

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61
Q

Multifidus muscle insertion

A

Spinous processes of the vertebrae

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62
Q

Multifidus muscle action

A

Stabilizes the vertebral column

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63
Q

Rotatores muscles innervation

A

Posterior rami of the spinal nerves

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64
Q

Rotatores muscle origin

A

Vertebral transfers processes

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65
Q

Rotatores muscle insertion

A

Lamina and spinous processes of the immediately superior vertebrae

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66
Q

Rotatores muscle action

A

Stabilizes the vertebral column and has a proprioceptive function

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67
Q

Interspinales muscle: describe location and function

A

Span b/w adjacent spinous processes

Action: stabilize the vertebral column

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68
Q

Intertransversari muscle: describe location and function

A

Spans b/w adjacent transverse processes

Action: stabilize the vertebral column

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69
Q

Levatores costarum muscle: describe location and function

A

Origin: transfers processes of C7-T11

Insertion: attaches to the rib immediately below

Action: elevates ribs

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70
Q

Pectoralis major innervation

A

Lateral and medial pectoral nerves

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71
Q

Pectoralis major origin

A

Clavicular head: anterior surface of the medial clavicle

Sternocostal head: anterior surface of the sternum, superior six costal cartilages and the aponeurosis of the external oblique muscle

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72
Q

Pectoralis major insertion

A

Both heads attach to the intertubercular sulcus of the humerus

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73
Q

Pectoralis major action

A

Adducts and medially rotates the upper limb, draws the scapula anteroinferiorly. The clavicular head also acts to flex the upper limb.

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74
Q

Pectoralis minor innervation

A

Medial pectoral nerve

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75
Q

Pectoralis minor origin

A

3rd and 5th ribs

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76
Q

Pectoralis minor insertion

A

Coracoid process of the scapula

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77
Q

Pectoralis minor action

A

Stabilizes the scapula by drawing it anteroinferiorly against the thoracic wall

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78
Q

Serratus anterior innervation

A

Long thoracic nerve

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79
Q

Serratus anterior origins

A

Lateral aspects of ribs 1-8

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80
Q

Serratus anterior insertion

A

Costal (rib facing) surface of the medial border of the scapula

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81
Q

Serratus anterior action

A

Rotates the scapula, allowing the arm to be raised over 90 degrees. Also holds the scapula against the ribcage.

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82
Q

Subclavius innervation

A

Nerve to subclavius

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83
Q

Subclavius origin

A

Junction of the 1st rib and its costal cartilage

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84
Q

Subclavius insertion

A

Inferior surface of the middle third of the clavicle

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85
Q

Subclavius action

A

Anchors and depresses the clavicle

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86
Q

Deltoid innervation

A

Axillary nerve

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87
Q

Deltoid origin

A

Scapular spine, acromion, lateral third of clavicle

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88
Q

Deltoid insertion

A

Humerus (deltoid tuberosity)

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89
Q

Deltoid actions

A

Flexion, internal rotation, adduction, aBduction, extension, external rotation

Abduction takes over from the supraspinatus which abducts the first 15 degrees

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90
Q

Biceps brachii innervation

A

Musculocutaneous n.

Biceps tendon reflex tests spinal cord segment C6

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91
Q

Biceps brachii origin

A

Long head: Supraglenoid tubercle of scapula

Short head: coracoid process of scapula

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92
Q

Biceps brachii insertion

A

Radial tuberosity and biciptial aponeurosis

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93
Q

Biceps brachii action

A

Supination of the forearm, flexion of the arm at elbow and shoulder, adduction and internal rotation of the humerus

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94
Q

Brachialis innervation

A

Musculocutaneous n. (C5-C6) and Radial n. (C7, minor)

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95
Q

Brachialis origin

A

Humerus (distal half of anterior surface)

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96
Q

Brachialis insertion

A

Ulnar tuberosity

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97
Q

Brachialis action

A

Flexion at the elbow joint

98
Q

Coracobrachialis innervation

A

Musculocutaneous n.

99
Q

Corachobrachialis origin

A

Coracoid process of the scapula

100
Q

Coracobrachialis insertion

A

Medial side of the humeral shaft (at the level of the deltoid tubercle)

101
Q

Coracobrachialis action

A

Flexion of the arm at the shoulder and weak adduction

102
Q

What artery supplies the BBC (biceps brachii, brachialis & coracobrachialis) muscles?

A

Brachial artery

103
Q

Triceps brachii innervation

A

Radial nerve

A tap of the triceps tendon tests spinal segment C7

104
Q

Triceps brachii origins

A

Long head: infraglenoid tubercle of scapula
Lateral head: posterior humerus (proximal to the radial groove)
Medial head: posterior humerus (distal to the radial groove)

105
Q

Triceps brachii insertion

A

Olecranon of the ulna

106
Q

Triceps brachii action

A

Extension of the arm at the elbow

107
Q

What artery supplies the triceps brachii (the posterior side of the arm)?

A

Profound a brachii artery

108
Q

Where does the common tendon for the flexor carpi ulnaris, palmaris longus, flexor carpi radialis and pronator teres originate?

A

Medial epicondyle of the humerus

109
Q

Flexor carpi ulnaris innervation

A

Ulnar nerve

110
Q

Flexor carpi ulnaris origin

A

Medial epicondyle of the humerus and long origin from the ulna

111
Q

Flexor carpi ulnaris insertion

A

Pisiform carpal bone

112
Q

Flexor carpi ulnaris action

A

Flexion and adduction at the wrist

113
Q

Palmaris longus innervation

A

Median nerve

114
Q

Palmaris longus origin

A

Medial epicondyle of the humerus

115
Q

Palmaris longus insertion

A

Flexor retinaculum of the wrist

116
Q

Palmaris longus action

A

Flexion at the wrist

117
Q

What lies directly underneath the palmaris longus?

A

The median nerve

Fun fact: the palmaris longus muscle is absent in 15% of the population

118
Q

Flexor carpi radialis innervation

A

Median nerve

119
Q

Flexor carpi radialis origin

A

Medial epicondyle of the humerus

120
Q

Flexor carpi radialis insertion

A

Base of metacarpals II and III

121
Q

Flexor carpi radialis action

A

Flexion and abduction at the wrist

122
Q

Pronator teres innervation

A

Median nerve

123
Q

Pronator teres origin

A

Medial epicondyle of humerus & coronoid process of the ulna

124
Q

Pronator teres insertion

A

Lateral radius, distal to supination insertion

125
Q

Pronator teres action

A

Pronation of the arm

126
Q

Flexor digitorum superficialis innervation

A

Median nerve

127
Q

Flexor digitorum superficialis origins

A

Two heads: one originates from the medial epicondyle of the the humerus and the other from the radius

128
Q

Flexor digitorum superficialis insertion

A

4 tendons that split at the wrist and travel through the carpal tunnel to insert on the middle phalanges of the 4 fingers

129
Q

Flexor digitorum superficialis action

A

Flexes the metacarpophalangeal joint and proximal interphalangeal joint at the 4 fingers 7 flexes at the wrist

130
Q

Flexor digitorum profundus innervation

A

Medial half (acts of the little and ring fingers) - ulnar nerve

Lateral half (acts on the middle and index fingers) - anterior interosseus branch of the median nerve

131
Q

Flexor digitorum profundus origin

A

Ulna and interosseus membrane

132
Q

Flexor digitorum profundus insertion

A

Splits into 4 tendons at the wrist that pass through the carpal tunnel and insert on the distal phalanges of the 4 fingers

133
Q

Flexor digitorum profundus action

A

The ONLY muscle that can flex the distal interphalangeal joints of the fingers, also flexes at metacarpophalangeal joints and the wrist

134
Q

Flexor pollicis longus innervation

A

Median nerve (anterior interosseus branch)

135
Q

Flexor pollicis longus origin

A

Anterior surface of the radius and surrounding interosseus membrane

136
Q

Flexor pollicis longus insertion

A

Base of the distal phalanx of the thumb

137
Q

Flexor pollicis longus action

A

Flexes the interphalangeal joint and metacarpophalangeal joint of the thumb

138
Q

Pronator quadratus innervation

A

Median nerve (anterior interosseus branch)

139
Q

Pronator quadratus origin

A

Anterior surface of the ulna

140
Q

Pronator quadratus insertion

A

Anterior surface of the radius

141
Q

Pronator quadratus action

A

Pronates the arm

142
Q

Which nerve innervates all muscles in the posterior compartment of the forearm?

A

Radial nerve

143
Q

Which superficial muscles of the posterior forearm share a common tendinous origin at the lateral epicondyle?

A

Extensor carpi radialis brevis m., extensor digitorum m., extensor carpi ulnaris m., and extensor digit minimi m.

144
Q

Brachioradialis innervation

A

Radial nerve

145
Q

Brachioradialis origin

A

Proximal aspect of the lateral supracondylar ridge of the humerus

146
Q

Brachioradialis insertion

A

Distal end of the radius, just before the radial styloid process

147
Q

Brachioradialis action

A

FLEXES at the ELBOW

*outlier because its origin and innervation (radial) are characteristic of an extensor muscle

148
Q

What are sandwhiched between the brachioradialis and the deep flexor muscles in the distal forearm?

A

The radial artery and nerve

149
Q

Extensor carpi radialis longus and brevis innervation

A

Radial nerve

150
Q

Extensor carpi radialis longus and brevis origin

A

ECRL: supracondylar ridge of distal humerus, lateral intermuscular septum

ECRB: lateral epicondyle of humerus

151
Q

Extensor carpi radialis longus and brevis insertion

A

Tendons attach to metacarpal bones II and III

152
Q

Extensor radialis longus and brevis action

A

Extend and abduct the wrist

153
Q

Extensor digitorum innervation

A

Radial nerve (deep branch)

154
Q

Extensor digitorum origin

A

Lateral epicondyle of humerus

155
Q

Extensor digitorum insertion

A

4 tendons that insert into the extensor hood of each finger

156
Q

Extensor digitorum action

A

Extends medial 4 fingers at the MCP and IP joints

*main extensor of the fingers - to test the function of the muscle, the forearm is pronated and the fingers extended against resistance

157
Q

Extensor digiti minimi innervation

A

Radial nerve (deep branch)

158
Q

Extensor digiti minimi origin

A

Lateral epicondyle of the humerus

159
Q

Extensor digiti minimi insertion

A

Into the extensor hood of the little finger (with the extensor digitorum tendon)

160
Q

Extensor digiti minimi action

A

Extends the little finger, contributes to extension at the wrist

In some people, extensor digiti minimi and extensor digitorum muscle are fused, typically the extensor digiti minimi lies medially to the extensor digitorum m.

161
Q

Extensor carpi ulnaris innervation

A

Radial nerve (deep branch)

162
Q

Extensor carpi ulnaris origin

A

Lateral epicondyle of the humerus

163
Q

Extensor carpi ulnaris insertion

A

Base of metacarpal V

164
Q

Extensor carpi ulnaris action

A

Extension and adduction of wrist

165
Q

Anconeus innervation

A

Radial nerve

166
Q

Anconeus origin

A

Originates from the lateral epicondyle of humerus

167
Q

Anconeus insertion

A

Posterior and lateral part of the olecranon of ulna

168
Q

Anconeus action

A

Extends and stabilize the elbow joint, abducts the ulna during pronation of the forearm

169
Q

The anconeus is blended in with the fibers of which muscle?

A

Triceps brachii

The two muscles are sometimes indistinguishable

170
Q

Describe tennis elbow

A

Lateral epiconylitis refers to inflammation of the periosteum of the lateral epicondyle caused by repeated use of the superficial extensor muscles which strains their common tendinous attachment to the lateral epicondyle.

171
Q

Supinator innervation

A

Radial nerve (deep branch)

172
Q

Supinator origin

A

2 heads: one originates from the lateral epicondyle of the humerus, one from the posterior surface of the ulna

*the deep branch of the radial nerve passes between the heads

173
Q

Supinator insertion

A

Posterior surface of the radius

174
Q

Supinator action

A

Supinator the forearm

175
Q

Abductor pollicis longus innervation

A

Radial nerve (posterior interosseus branch)

176
Q

Abductor pollicis longus origin

A

Interosseus membrane and the adjacent posterior surfaces of the radius and ulna

177
Q

Abductor pollicis longus insertion

A

Lateral side of the base of metacarpal I

178
Q

Abductor pollicis longus action

A

Abducts the thumb

179
Q

Extensor pollicis brevis innervation

A

Radial nerve (posterior interosseus branch)

180
Q

Extensor pollicis brevis origin

A

Posterior surface of the radius and interosseus membrane

181
Q

Extensor pollicis brevis insertion

A

Base of the proximal phalanx of the thumb

182
Q

Extensor pollicis brevis action

A

Extends at the metacarpophalangeal and carpometacarpal joint of the thumb

183
Q

Extensor pollicis longus innervation

A

Radial nerve (posterior interosseus branch)

184
Q

Extensor pollicis longus origin

A

Posterior surface of the ulna and interosseus membrane

185
Q

Extensor pollicis longus insertion

A

Distal phalanx of the thumb

186
Q

Extensor pollicis longus action

A

Using the dorsal tubercle of the radius as a pulley for its tendon, the muscle extends all joints of the thumb: carpometacarpal, metacarpophalangeal and interphalangeal

187
Q

Extensor indicis proprius innervation

A

Radial nerve (posterior interosseus branch)

188
Q

Extensor indicis proprius origin

A

Posterior surface of the ulna and interosseus membrane, distal to the extensor pollicis longus

189
Q

Extensor indicis proprius insertion

A

Extensor hood of the index finger

190
Q

Extensor indicis proprius action

A

Extends the index finger

191
Q

Injury to which nerve causes “wrist drop”?

Where does the injury typically happen?

A

Radial nerve injury proximal to the elbow

Axilla - injured via humeral dislocations or fracture of the proximal humerus

Radial groove of the humerus - injured via a humeral shaft fracture

Radial nerve innervates all muscles in the extensor compartment so with a lesion they are paralyzed, while the wrist flexors (innervated but the median nerve) are unaffected leading to unopposed flexion

192
Q

Describe the borders of the anatomical snuff box

A

Medial/ulnar: tendon of the extensor pollicis longus

Lateral/radial: tendons of the abductor pollicis longus and extensor pollicis brevis

Proximal: styloid process of the radius

Floor: carpal bones; scaphoid and trapezium

Roof: skin

193
Q

Describe the contents of the anatomical snuffbox

A

Radial artery, a branch of the radial nerve and the cephalic vein (more subcutaneous)

Subcutaneously, terminal branches of the superficial branch of the radial nerve run across the roof of the anatomical snuffbox providing innervation to the skin of the lateral 3 1/2 digits on the dorsal of the hand and associated palm area

194
Q

Describe the potential severity of a scaphoid fracture

A

If localized pain is reported in the anatomical snuffbox after falling on an outstretched hand, it’s likely a fracture of the scaphoid.

Because the scaphoid unique blood supply runs distal to proximal, a fracture can disrupt the blood supply to the proximal portion - emergency! Failure to revascularize the scaphoid can lead to a vascular necrosis and future arthritis.

195
Q

Opponens pollicis innervation

A

Median nerve

196
Q

Opponens pollicis origin

A

Tubercle of the trapezium and the associated flexor retinaculum

(Part of the thenar eminence)

197
Q

Opponens pollicis insertion

A

Lateral margin of the metacarpal of the thumb

198
Q

Opponens pollicis action

A

Opposes the thumb by medially rotating and flexing the metacarpal on the trapezium

199
Q

Abductor pollicis brevis innervation

A

Median nerve

200
Q

Abductor pollicis brevis origin

A

Tubercle of the scaphoid and trapezium and from the associated flexor retinaculum

(Part of the thenar eminence)

201
Q

Abductor pollicis brevis insertion

A

Lateral side of the proximal phalanx of the thumb

202
Q

Abductor pollicis brevis action

A

Abducts the thumb

203
Q

Flexor pollicis brevis innervation

A

Median nerve

204
Q

Flexor pollicis brevis origin

A

Tubercle of the trapezium and from the associated flexor retinaculum

(Part of the thenar eminence)

205
Q

Flexor pollicis brevis insertion

A

Base of the proximal phalanx of the thumb

206
Q

Flexor pollicis brevis action

A

Flexes the metacarpophalangeal (MCP) joint of the thumb

Most distal of the thenar eminence muscles

207
Q

Opponens digiti minimi innervation

A

Ulnar nerve

208
Q

Opponens digiti minimi origin

A

Hook of hamate and associated flexor retinaculum

Deepest of the hypothenar muscles

209
Q

Opponens digiti minimi insertion

A

Medial margin of metacarpal V

210
Q

Opponens digiti minimi action

A

Rotates the metacarpal of the little finger towards the palm, producing opposition

211
Q

Abductor digiti minimi innervation

A

Ulnar nerve

212
Q

Abductor digiti minimi origin

A

Pisisform and tendon of the flexor carpi ulnaris

Most superficial of the hypothenar muscles

213
Q

Abductor digiti minimi insertion

A

Base of the proximal phalanx of the little finger

214
Q

Abductor digiti minimi action

A

Abducts the little finger

215
Q

Flexor digiti minimi brevis innervation

A

Ulnar nerve

216
Q

Flexor digiti minimi brevis origin

A

Hook of hamate and adjacent flexor retinaculum

217
Q

Flexor digiti minimi insertion

A

Base of the proximal phalanx of the little finger

218
Q

Flexor digiti minimi brevis action

A

Flexes the MCP joint of the little finger

219
Q

Denervation of lumbrical muscles in the hand is the basis for what two “signs”?

A

Ulnar claw and hand of benediction

220
Q

Lumbricals innervation

A

Medial 2 lumbricals (little and ring fingers): ulnar nerve

Lateral 2 lumbricals (index and middle fingers): median nerve

221
Q

Lumbricals origin

A

Each originates from a tendon of the flexor digitorum profundus

222
Q

Lumbricals insertion

A

Each passes dorsal and laterally around each finger and insert into the extensor hood

223
Q

Lumbricals action

A

Flex at the MCP joint, extend at the IP (interphalangeal) joint of each finger

224
Q

Dorsal Interossei innervation

A

Ulnar nerve

225
Q

Dorsal interossei origin

A

Each interossei originates from the lateral and medial surfaces of the metacarpals

(Most superficial of the dorsal muscles)

226
Q

Dorsal interossei insertion

A

Extensor hood and proximal phalanx of each finger

227
Q

Dorsal interossei action

A

Abduct the fingers at the MCP joint

228
Q

Palmar interossei innervation

A

Ulnar nerve

229
Q

Palmar interossei origin

A

Medial or lateral surface of a metacarpal

230
Q

Palmar interossei insertion

A

Extensor hood and proximal phalanx

231
Q

Palmar interossei action

A

Adducts the fingers at the MCP joint

232
Q

Palmaris brevis innervation

A

Ulnar nerve

233
Q

Palmaris brevis origin

A

Palmar aponeurosis and flexor retinaculum

234
Q

Palmaris brevis insertion

A

Dermis of the skin on the medial margin of the hand

235
Q

Palmaris brevis action

A

Wrinkles the skin of the hypothenar eminence and deepens the curvature of the hand, improving grip

236
Q

Adductor pollicis innervation

A

Ulnar nerve

237
Q

Adductor pollicis origin

A

2 heads: one originates from metacarpal III, the other from the capitate and adjacent areas of metacarpals II and III

238
Q

Adductor pollicis insertion

A

Base of the proximal phalanx of the thumb

239
Q

Adductor pollicis action

A

Adductor of the thumb

240
Q

What passes anteriorly through the space between the two head of the adductor pollicis?

A

Radial artery - it then forms the deep palmar arch

LRH MSK Exam 2 (1 decks)

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