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Anatomy > Upper Extremity > Flashcards

Upper Extremity Flashcards

1
Q

Origin: Trapezius

A
  1. Medial part of superior nuchal line
  2. Ligamentum nuchae (an expansion of the supraspinous ligament)
  3. Thoracic spinous processes
  4. Supraspinous ligament
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2
Q

Insertion: Trapezius

A
  1. Lateral part of the clavicle
  2. Acromion
  3. Spine of the scapula
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3
Q

Innervation: Trapezius

A

Motor from spinal portion of accessory nerve (CN XI)

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4
Q

Action: Trapezius

A
  1. Acting as a whole, trapezius rotates scapula upward
  2. Acting individually,
    a. Upper trap: rotates scapula upward
    b. Middle trap: retracts (adducts) scapula
    c. Lower trap: depresses and upwardly rotates scapula
    eg: cyclist extending neck over handlebars, holding phone between shoulder and ear, carrying bags on shoulder, pulling shoulders back
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5
Q

Notes: Trapezius

A

Most superficial layer of superficial back muscles

Nerve runs on deep side of muscle with superficial branch of transverse cervical artery

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6
Q

Origin: Latissimus Dorsi

A
  1. Spinous processes of T7-T12
  2. Lumbar aponeurosis (thoracolumbar fascia)
  3. Crest of ilium
  4. Lower 3 or 4 ribs
  5. Inferior angle of scapula
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7
Q

Insertion: Latissimus Dorsi

A

Floor of bicipital groove of humerus

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8
Q

Innervation: Latissimus Dorsi

A

Thoracodorsal nerve (from brachial plexus)

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9
Q

Action: Latissimus Dorsi

A
  1. Shoulder extension
  2. Shoulder internal rotation
  3. Shoulder adduction
  4. Can also contribute to scapular depression and retraction (adduction)

eg: paddling a kayak, walking with crutches, unzipping dress

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10
Q

Notes: Latissimus Dorsi

A

Most superficial layer of superficial back muscles

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11
Q

Origin: Levator Scapulae

A

Transverse processes of C1-C4

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12
Q

Insertion: Levator Scapulae

A

Vertebral border between the spine and the superior angle of scapula

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13
Q

Innervation: Levator Scapulae

A

Dorsal scapular nerve

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14
Q

Action: Levator Scapulae

A
  1. Elevation of scapula
  2. Downward rotation of scapula

eg: rotating head, holding phone between ear and shoulder

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15
Q

Notes: Levator Scapulae

A

Intermediate layer of superficial back muscles

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16
Q

Origin: Rhomboid Minor

A

Spinous processes of C7 and T1

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17
Q

Insertion: Rhomboid Minor

A

Vertebral border of scapula at base of spine

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18
Q

Innervation: Rhomboid Minor

A

Dorsal scapular nerve

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19
Q

Action: Rhomboid Minor

A
  1. Downward rotation of scapula
  2. Retraction (adduction) of scapula
  3. Elevation of scapula
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20
Q

Notes: Rhomboid Minor

A

Intermediate layer of superficial back muscles

Nerve lies on deep surface with deep branch of transverse cervical artery

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21
Q

Origin: Rhomboid Major

A

Spinous processes T2-T5

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22
Q

Insertion: Rhomboid Major

A

Vertebral border of scapula below rhomboid minor to the inferior angle

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23
Q

Innervation: Rhomboid Major

A

Dorsal scapular nerve

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24
Q

Action: Rhomboid Major

A
  1. Downward rotation of scapula
  2. Retraction (adduction) of scapula
  3. Elevation of scapula
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25
Q

Notes: Rhomboid Major

A

Intermediate layer of superficial back muscles

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26
Q

Origin: Serratus Posterior Superior

A

Spinous processes of C7-T2

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27
Q

Insertion: Serratus Posterior Superior

A

Upper ribs

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28
Q

Innervation: Serratus Posterior Superior

A

Intercostal nerves T2-T5 (ventral rami)

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29
Q

Action: Serratus Posterior Superior

A

Assists in lifting ribs in inspiration

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30
Q

Notes: Serratus Posterior Superior

A

Deepest layer of superficial back muscles

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31
Q

Origin: Serratus Posterior Inferior

A

Spinous processes T11-L2

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32
Q

Insertion: Serratus Posterior Inferior

A

Lower ribs

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33
Q

Innervation: Serratus Posterior Inferior

A

Intercostal nerves T9-T12 (ventral rami)

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34
Q

Action: Serratus Posterior Inferior

A

Unclear, may hold lower ribs down during inspiration

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35
Q

Notes: Serratus Posterior Inferior

A

Deepest layer of superficial back muscles

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36
Q

Origin: Serratus Anterior

A

Digitations from ribs 1-8

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37
Q

Insertion: Serratus Anterior

A
  1. Vertebral border on costal surface of scapula

2. Inferior angle of scapula

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38
Q

Innervation: Serratus Anterior

A

Long thoracic nerve

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39
Q

Action: Serratus Anterior

A
  1. Scapula protraction (abduction)
  2. Rotates scapula (glenoid) upward

eg: push up, throwing a punch, opening a swinging door

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40
Q

Notes: Serratus Anterior

A

Scapular winging if serratus anterior denervated

Important in scapulohumeral rhythm

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41
Q

Origin: Deltoid

A
  1. Lower margin of lateral 1/3 of clavicle
  2. Acromion
  3. Lower margin of scapular spine
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42
Q

Insertion: Deltoid

A

Deltoid tuberosity of humerus

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43
Q

Innervation: Deltoid

A

Axillary nerve

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44
Q

Action: Deltoid

A
  1. Acting as a whole, deltoid stabilizes glenohumeral (GH) joint
  2. Acting individually,
    a. Anterior fibers: shoulder flexion and horizontal adduction
    b. Middle fibers: shoulder abduction
    c. Posterior fibers: shoulder extension and horizontal abduction
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45
Q

Origin: Subscapularis

A

Costal surface of scapula (subscapular fossa)

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46
Q

Insertion: Subscapularis

A

Lesser tubercle of humerus

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47
Q

Innervation: Subscapularis

A

Upper and lower subscapular nerves

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48
Q

Action: Subcapularis

A
  1. Stabilizes GH (glenohumeral) joint
  2. Shoulder internal rotation

eg: reaching hand around to scratch back; clutching a book to chest

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49
Q

Notes: Subscapularis

A

Rotator cuff muscle

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50
Q

Origin: Supraspinatus

A

Supraspinous fossa

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51
Q

Insertion: Supraspinatus

A

Superior facet of greater tubercle of humerus

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52
Q

Innervation: Supraspinatus

A

Suprascapular nerve

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53
Q

Action: Supraspinatus

A
  1. Stabilizes GH joint
  2. Shoulder abduction
  3. Depresses humeral head during abduction

eg: conducting an orchestra, installing ceiling tiles overhead

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54
Q

Notes: Supraspinatus

A

Rotator cuff muscle

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55
Q

Origin: Infraspinatus

A

Infraspinous fossa

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56
Q

Insertion: Infraspinatus

A

Middle facet of greater tubercle

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57
Q

Innervation: Infraspinatus

A

Suprascapular nerve

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58
Q

Action: Infraspinatous

A
  1. Stabilizes GH joint
  2. Shoulder external rotation

eg: starting a pull-cord lawn mower

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59
Q

Notes: Infraspinatus

A

Rotator cuff muscle

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60
Q

Origin: Teres Minor

A

Lateral border of scapula, above teres major

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61
Q

Insertion: Teres Minor

A

Lower facet of greater tubercle

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62
Q

Innervation: Teres Minor

A

Axillary nerve

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63
Q

Action: Teres Minor

A
  1. Stabilizes joint
  2. Shoulder external rotation

eg: starting a pull-cord lawn mower

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64
Q

Notes: Teres Minor

A

Rotator cuff muscle

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65
Q

Origin: Teres Major

A

Lower lateral border of scapula, as far as inferior angle

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66
Q

Insertion: Teres Major

A

Medial lip of bicipital groove

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67
Q

Innervation: Teres Major

A

Lower subscapular nerve

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68
Q

Action: Teres Major

A
  1. Shoulder internal rotation
  2. Shoulder adduction
  3. Shoulder extension
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69
Q

Origin: Coracobrachialis

A

Coracoid process

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70
Q

Insertion: Coracobrachialis

A

Middle shaft of humerus

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71
Q

Innervation: Coracobrachialis

A

Musculocutaneous nerve

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72
Q

Action: Coracobrachialis

A
  1. Shoulder flexion
  2. Shoulder adduction

eg: reaching around face to scratch opposite ear; doing a bench press

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73
Q

Notes: Coracobrachialis

A

Anterior compartment

Musculocutaneous nerve pierces coracobrachialis muscle belly

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74
Q

Origin: Biceps Brachii

A
  1. Short head: coracoid process

2. Long head: supraglenoid tubercle (blends with labrum, see notes)

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75
Q

Insertion: Biceps Brachii

A

Radial tuberosity (radius)

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76
Q

Innervation: Biceps Brachii

A

Musculocutaneous nerve

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77
Q

Action: Biceps Brachii

A
  1. Elbow flexion
  2. Forearm supination
  3. Shoulder flexion

eg: carrying infant in cradled arms, tightening a screw with right arm, holding heavy hymnal while singing

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78
Q

Notes: Biceps Brachii

A
  • Anterior compartment
  • Tendinous origin of long head runs in fibrous capsule of GH joint (enclosed in synovial membrane,) travels in bicipital groove, held down by transverse humeral ligament
  • Two tendons fuse into one muscle belly
  • Prior to insertion gives off bicipital aponeurosis medially, which fuses with deep fascia
  • In 10% a third head can be found arising from the humerus
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79
Q

Origin: Brachialis

A

Lower, anterior humerus

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80
Q

Insertion: Brachialis

A

Coronoid process

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81
Q

Innervation: Brachialis

A

Musculocutaneous nerve

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82
Q

Action: Brachialis

A

Elbow flexor in both supination and pronation

eg: bringing food from plate to mouth; picking up heavy books; carrying baby car seat

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83
Q

Notes: Brachialis

A

Anterior compartment

Possibly dual innervation from radial nerve

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84
Q

Origin: Triceps Brachii

A
  1. Long head: infraglenoid tubercle
  2. Lateral head: posterior humerus above the spiral groove
  3. Medial head: posterior humerus below the spiral groove (deep)
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85
Q

Insertion: Triceps Brachii

A

Olecranon process

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86
Q

Innervation: Triceps Brachii

A

Radial nerve

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87
Q

Action: Triceps Brachii

A
  1. Elbow extension
  2. Long head can adduct and extend shoulder

eg: slamming trunk of car; push up; dribbling basketball

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88
Q

Notes: Triceps Brachii

A

Posterior compartment

Long head runs anterior to teres minor and posterior to teres major muscles

Long and lateral heads form the superficial part of the muscle

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89
Q

Origin: Anconeous

A

Lateral epicondyle of humerus

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90
Q

Insertion: Anconeous

A
  1. Lateral surface of olecranon

2. Lateral ulna

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91
Q

Innervation: Anconeous

A

Radial nerve

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92
Q

Action: Anconeous

A

Elbow extension

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93
Q

Notes: Anconeous

A

Posterior compartment

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94
Q

Origin: Pectoralis Major

A
  1. Clavicular head: medial 1/3 of clavicle
  2. Sternal head: sternum, upper 6 costal cartilages
  3. Aponeurosis of external oblique
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95
Q

Insertion: Pectoralis Major

A

Lateral lip of bicipital (intertubercular) groove of humerus

  1. Clavicular fibers insert lower part of groove
  2. Sternal fibers insert in higher part of groove
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96
Q

Innervation: Pectoralis Major

A

Medial and lateral pectoral nerves

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97
Q

Action: Pectoralis Major

A
  1. Shoulder adduction
  2. Shoulder flexion
  3. Shoulder internal rotation

eg: chin-up, swimming, sawing wood

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98
Q

Origin: Pectoralis Minor

A

Ribs 2-5 (may vary)

99
Q

Insertion: Pectoralis Minor

A

Coracoid process of scapula

100
Q

Innervation: Pectoralis Minor

A

Medial and lateral pectoral nerves

101
Q

Action: Pectoralis Minor

A
  1. Protraction of scapula
  2. Scapular depression

eg: throwing a punch, reaching into deep front pocket, taking deep inhale

102
Q

Origin: Subclavius

A

First rib

103
Q

Insertion: Subclavius

A

Clavicle

104
Q

Innervation: Subclavius

A

Nerve to subclavius

105
Q

Action: Subclavius

A

Elevates first rib

106
Q

Origin: Pronator Teres

A

2 heads

  1. Medial epicondyle (common flexor origin)
  2. Coronoid process of ulna
107
Q

Insertion: Pronator Teres

A

Mid-radius

108
Q

Innervation: Pronator Teres

A

Median nerve

109
Q

Action: Pronator Teres

A
  1. Pronation of forearm

2. Weak flexor of elbow

110
Q

Notes: Pronator Teres

A

Superficial layer

Median nerve passes between 2 heads

111
Q

Origin: Flexor Carpi Radialis

A

Medial epicondyle (common flexor origin)

112
Q

Insertion: Flexor Carpi Radialis

A

Base of 2nd metacarpal

113
Q

Innervation: Flexor Carpi Radialis

A

Median nerve

114
Q

Action: Flexor Carpi Radialis

A
  1. Wrist flexion

2. Wrist radial deviation (with extensor carpi radialis longus)

115
Q

Notes: Flexor Carpi Radialis

A

Superficial layer

116
Q

Origin: Palmaris Longus

A

Medial epicondyle (common flexor origin)

117
Q

Insertion: Palmaris Longus

A

Palmar aponeurosis

118
Q

Innervation: Palmaris Longus

A

Median nerve

119
Q

Action: Palmaris Longus

A

Wrist flexion

120
Q

Notes: Palmaris Longus

A

Superficial layer

Absent in 10%

121
Q

Origin: Flexor Carpi Ulnaris

A

2 heads

  1. Medial epicondyle (common flexor origin)
  2. Posterior border of upper ulna
122
Q

Insertion: Flexor Carpi Ulnaris

A
  1. Pisiform
  2. Hamate
  3. Base of 5th metacarpal
123
Q

Innervation: Flexor Carpi Ulnaris

A

Ulnar nerve

124
Q

Action: Flexor Carpi Ulnaris

A
  1. Wrist flexion

2. Ulnar deviation of wrist (with extensor carpi ulnaris)

125
Q

Notes: Flexor Carpi Ulnaris

A

Superficial layer

126
Q

Origin: Flexor Digitorum Superficialis

A

2 heads

  1. Medial epicondyle (common flexor origin), and coronoid process of ulna
  2. Upper radius
127
Q

Insertion: Flexor Digitorum Superficialis

A

4 tendons insert on each side of base of the middle phalanx, tendons split to allow profundus tendon to pass through

128
Q

Innervation: Flexor Digitorum Superficialis

A

Median nerve

129
Q

Action: Flexor Digitorum Superficialis

A

Flexes proximal interphalangeal joint

130
Q

Notes: Flexor Digitorum Superficialis

A

Intermediate layer

Tendons lie in a common synovial sheath under flexor retinaculum that is shared with the flexor digitorum profundus

Middle and ring finger tendons are above index and little finger tendons

131
Q

Origin: Flexor Pollicis Longus

A
  1. Middle radius

2. Interosseous membrane

132
Q

Insertion: Flexor Pollicis Longus

A

Base of distal phalanx of thumb

133
Q

Innervation: Flexor Pollicis Longus

A

Median nerve (anterior interosseous nerve)

134
Q

Action: Flexor Pollicis Longus

A
  1. Flexes distal phalanx of thumb at IP joint

2. Flexes proximal phalanx of thumb at MCP joint

135
Q

Notes: Flexor Pollicis Longus

A

Deep layer

136
Q

Origin: Flexor Digitorum Profundus

A
  1. Upper 3/4 of ulna

2. Interosseous membrane

137
Q

Insertion: Flexor Digitorum Profundus

A

Base of distal phalanx

138
Q

Innervation: Flexor Digitorum Profundus

A

Dual innervation

1. Median nerve to muscle going to digits 2 and 3 (anterior interosseous nerve) 
2. Ulnar nerve to muscle going to digits 4 and 5
139
Q

Action: Flexor Digitorum Profundus

A

Flexes distal phalanx

140
Q

Notes: Flexor Digitorum Profundus

A

Deep layer

141
Q

Origin: Pronator Quadratus

A

Distal ulna

142
Q

Insertion: Pronator Quadratus

A

Distal radius

143
Q

Innervation: Pronator Quadratus

A

Median nerve (anterior interosseous nerve)

144
Q

Action: Pronator Quadratus

A

Pronation of forearm

145
Q

Notes: Pronator Quadratus

A

Deep layer

146
Q

Origin: Palmaris Brevis

A

Hypothenar fascia

147
Q

Insertion: Palmaris Brevis

A

Skin of ulnar border of the hand

148
Q

Innervation: Palmaris Brevis

A

Ulnar nerve

149
Q

Action: Palmaris Brevis

A
  1. Moves skin

2. Improves contour for grip

150
Q

Notes: Palmaris Brevis

A

Hypothenar eminence

151
Q

Origin: Lumbricals

A

From radial side of tendons of flexor digitorum profundus muscle while leaving common tendon sheath

152
Q

Insertion: Lumbricals

A

Extensor hood (aponeurosis)

153
Q

Innervation: Lumbricals

A
  1. Median nerve: lumbricals 1 and 2

2. Ulnar nerve: lumbricals 3 and 4

154
Q

Action: Lumbricals

A

Flexion of MCP joints with extension of IP joints

155
Q

Notes: Lumbricals

A

Pass to radial side of MCP joint

156
Q

Origin: Adductor Pollicis

A

2 heads

  1. Transverse from 3rd metacarpal
  2. Oblique from base of metacarpals 1, 2, and 3
157
Q

Insertion: Adductor Pollicis

A

Base of proximal phalanx of the thumb

158
Q

Innervation: Adductor Pollicis

A

Ulnar nerve

159
Q

Action: Adductor Pollicis

A

Adduction of the thumb

160
Q

Origin: Palmar Interossei

A

Each has 1 head arising from the adjacent metacarpal

  1. 1st interossei from ulnar side of 2nd metacarpal
  2. 2nd interossei from radial side of 4th metacarpal
  3. 3rd interossei from radial side of 5th metacarpal
161
Q

Insertion: Palmar Interossei

A

Extensor aponeurosis

162
Q

Innervation: Palmar Interossei

A

Deep branch of ulnar nerve

163
Q

Action: Palmar Interossei

A
  1. Adduction and flexion at MCP

2. Extension at IP

164
Q

Origin: Dorsal Interossei

A

Each interossei has 2 heads arising from the adjacent metacarpal

165
Q

Insertion: Dorsal Interossei

A

Proximal phalanx and extensor tendon (hood)

a. 1st interossei to radial side of index finger 
b. 2nd interossei to radial side of middle finger 
c. 3rd interossei to ulnar side of middle finger 
d. 4th interossei to ulnar side of ring finger
166
Q

Innervation: Dorsal Interossei

A

Ulnar nerve

167
Q

Action: Dorsal Interossei

A
  1. Abduction and flexion at MCP

2. Extension at IP

168
Q

Origin: Abductor Pollicis Brevis

A
  1. Distal border of flexor retinaculum

2. Trapezium

169
Q

Insertion: Abductor Pollicis Brevis

A

Base of proximal phalanx of thumb

170
Q

Innervation: Abductor Pollicis Brevis

A

Recurrent branch of median nerve

171
Q

Action: Abductor Pollicis Brevis

A

Abducts thumb

172
Q

Notes: Abductor Pollicis Brevis

A

Thenar eminence

173
Q

Origin: Flexor Pollicis Brevis

A

2 heads

  1. Superficial head: distal flexor retinaculum and trapezium
  2. Deep head: trapezoid
174
Q

Insertion: Flexor Pollicis Brevis

A

Base of proximal phalanx of thumb

175
Q

Innervation: Flexor Pollicis Brevis

A
  1. Superficial head: recurrent branch of median nerve

2. Deep head: ulnar nerve

176
Q

Action: Flexor Pollicis Brevis

A

Flexes metacarpophalangeal (MCP) joint

177
Q

Notes: Flexor Pollicis Brevis

A

Thenar eminence

178
Q

Origin: Opponens Pollicis

A
  1. Flexor retinaculum

2. Trapezium

179
Q

Insertion: Opponens Pollicis

A

1st metacarpal

180
Q

Innervation: Opponens Pollicis

A

Recurrent branch of median nerve

181
Q

Action: Opponens Pollicis

A

Opposition of thumb (movement at carpometacarpal joint)

182
Q

Notes: Opponens Pollicis

A

Thenar eminence

Covered by flexor and abductor brevis muscles

183
Q

Origin: Abductor Digiti Minimi

A
  1. Pisiform bone

2. Adjacent tendons of flexor carpi ulnaris

184
Q

Insertion: Abductor Digiti Minimi

A

Base of proximal phalanx of little finger

185
Q

Innervation: Abductor Digiti Minimi

A

Deep branch of ulnar nerve

186
Q

Action: Abductor Digiti Minimi

A

Abducts little finger

187
Q

Notes: Abductor Digiti Minimi

A

Hypothenar eminence

188
Q

Origin: Flexor Digiti Minimi Brevis

A
  1. Flexor retinaculum

2. Hamate

189
Q

Insertion: Flexor Digiti Minimi Brevis

A

Proximal phalanx

190
Q

Innervation: Flexor Digiti Minimi Brevis

A

Deep branch of ulnar nerve

191
Q

Action: Flexor Digiti Minimi Brevis

A

Flexes MCP joint

192
Q

Notes: Flexor Digiti Minimi Brevis

A

Hypothenar eminence

193
Q

Origin: Opponens Digiti Minimi

A
  1. Distal flexor retinaculum

2. Hook of hamate

194
Q

Insertion: Opponens Digiti Minimi

A

5th metacarpal

195
Q

Innervation: Opponens Digiti Minimi

A

Deep branch of ulnar nerve

196
Q

Action: Opponens Digiti Minimi

A

Opposition of little finger

197
Q

Notes: Opponens Digiti Minimi

A

Hypothenar eminence

Covered by abductor and flexor digiti minimi muscles

198
Q

Origin: Brachioradialis

A

Upper lateral supracondylar ridge of humerus

199
Q

Insertion: Brachioradialis

A

Lateral radius above styloid process

200
Q

Innervation: Brachioradialis

A

Radial nerve

201
Q

Action: Brachioradialis

A
  1. Flexion of forearm in neutral position
  2. Supinates pronated forearm
  3. Pronates supinated forearm

eg: turning door handle; whisking cream

202
Q

Origin: Extensor Carpi Radialis Longus

A

Lower lateral supracondylar ridge

203
Q

Insertion: Extensor Carpi Radialis Longus

A

Base of second metacarpal

204
Q

Innervation: Extensor Carpi Radialis Longus

A

Radial nerve

205
Q

Action: Extensor Carpi Radialis Longus

A
  1. Wrist extension

2. Contributes to radial deviation (with flexor carpi radialis)

206
Q

Origin: Extensor Carpi Radialis Brevis

A

Lateral epicondyle (common extensor tendon)

207
Q

Insertion: Extensor Carpi Radialis Brevis

A

Base of third metacarpal

208
Q

Innervation: Extensor Carpi Radialis Brevis

A

Deep branch of radial nerve

209
Q

Action: Extensor Carpi Radialis Brevis

A

Wrist extension

210
Q

Origin: Extensor Digitorum

A

Lateral epicondyle (common extensor tendon)

211
Q

Insertion: Extensor Digitorum

A

Extensor hood

212
Q

Innervation: Extensor Digitorum

A

Deep branch of radial nerve

213
Q

Action: Extensor Digitorum

A

Extension of all joints of the digits

214
Q

Notes: Extensor Digitorum

A

Extensor hood mechanism

a. 3 or 4 tendons pass under retinaculum
b. Give off intertendinous connections
c. 1st and 4th tendons joined by extensor indicis tendon and tendon of extensor digiti minimi at MCP jt
d. At MCP jts the tendons expand laterally to cover the joint and are joined by the insertions of the lumbricals and interossei, forming the extensor aponeurosis (hood)
e. Aponeurosis splits into 3 bands, 2 lateral and 1 central
f. Central band inserts on the middle phalanx
g. Lateral bands come together as one to insert on the distal phalanx

215
Q

Origin: Extensor Digiti Minimi

A

Lateral epicondyle (common extensor tendon)

216
Q

Insertion: Extensor Digiti Minimi

A

Extensor hood of 5th finger

217
Q

Innervation: Extensor Digiti Minimi

A

Deep branch of radial nerve

218
Q

Action: Extensor Digiti Minimi

A

Extension of the fifth finger

219
Q

Origin: Extensor Carpi Ulnaris

A

2 heads

  1. Lateral epicondyle (common extensor tendon)
  2. Middle posterior ulna
220
Q

Insertion: Extensor Carpi Ulnaris

A

Base of 5th metacarpal

221
Q

Innervation: Extensor Carpi Ulnaris

A

Deep branch of radial nerve

222
Q

Action: Extensor Carpi Ulnaris

A
  1. Wrist extension

2. Ulnar deviation (with flexor carpi ulnaris)

223
Q

Origin: Supinator

A
  1. Lateral epicondyle
  2. Radial collateral and annular ligaments
  3. Supinator crest of the ulna
224
Q

Insertion: Supinator

A

Upper radius

225
Q

Innervation: Supinator

A

Deep branch of radial nerve

226
Q

Action: Supinator

A

Supinates the forearm

227
Q

Notes: Supinator

A

Radial nerve pierces through supinator muscle belly

228
Q

Origin: Abductor Pollicis Longus

A
  1. Posterior ulna
  2. Posterior radius
  3. Interosseous membrane
229
Q

Insertion: Abductor Pollicis Longus

A

Base of the 1st metacarpal

230
Q

Innervation: Abductor Pollicis Longus

A

Deep branch of radial nerve

231
Q

Action: Abductor Pollicis Longus

A

Abducts the thumb

232
Q

Origin: Extensor Pollicis Brevis

A
  1. Distal radius

2. Interosseous membrane

233
Q

Insertion: Extensor Pollicis Brevis

A

Base of proximal phalanx of thumb

234
Q

Innervation: Extensor Pollicis Brevis

A

Deep branch of radial nerve

235
Q

Action: Extensor Pollicis Brevis

A

Extends thumb MCP joint

236
Q

Origin: Extensor Pollicis Longus

A
  1. Posterior ulna
  2. Interosseous membrane
    (see notes)
237
Q

Insertion: Extensor Pollicis Longus

A

Distal phalanx of thumb

238
Q

Innervation: Extensor Pollicis Longus

A

Deep branch of radial nerve

239
Q

Action: Extensor Pollicis Longus

A

Extends thumb

240
Q

Notes: Extensor Pollicis Longus

A

Origin lies between abductor pollicis longus and extensor pollicis brevis

241
Q

Origin: Extensor Indicis

A

Posterior distal ulna

242
Q

Insertion: Extensor Indicis

A

Extensor hood of index finger

243
Q

Innervation: Extensor Indicis

A

Deep branch of radial nerve

244
Q

Action: Extensor Indicis

A

Extension of index finger

Anatomy (7 decks)

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