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Flashcards in Upper Extremity, Snell Deck (266):
1

Base of the breast extends from which ribs

2nd to 6th

2

Base of the breast extends from which lines

Margin of sternum to midaxillary line

3

Superficial vs deep fascia: Greater part of mammary gland

Superficial

4

Part of mammary gland that pierces the deep fascia

Axillary tail

5

Mammary glands are separated from deep fascia by loose areolar tissue called

Retromammary space

6

Each mammary gland consists of ___ lobes

15-20

7

Acts as a small reservoir for secreted milk

Lactiferous sinus

8

Blood supply of breast (2)

1) Lateral thoracic and thoracoacromial from axillary artery
2) Perforating branches of the internal thoracic and intercostal arteries

9

Breast lymphatics: Lateral quadrants

Anterior axillary or pectoral nodes

10

Breast lymphatics: Medial quadrants

Internal thoracic nodes

11

Bones of the shoulder girdle (2)

1) Scapula
2) Clavicle

12

Most common fractured bone in the body

Clavicle

13

Clavicular fracture is MOST COMMONLY due to

Fall on the shoulder or outstretched hand

14

Clavicle: Articulates medially with (2)

1) Sternum
2) First costal cartilage

15

Clavicle: Articulates laterally with

Scapula

16

Clavicle: Convex forward

Medial 2/3

17

Clavicle: Concave forward

Lateral 1/3

18

Scapula: Articulates with the clavicle

Acromion

19

Scapula: Articulates with the head of humerus

Glenoid fossa

20

Scapula: Medial to the base of the coracoid process

Suprascapular notch

21

Scapula: Concave anterior surface

Subscapular fossa

22

Humerus: Articulates with glenoid fossa

Head

23

Humerus: Immediately below the head

Anatomical neck

24

Humerus: Below the anatomic neck

Greater and lesser tuberosities

25

Humerus: Greater and lesser tuberosities are separated from each other by

Bicipital groove

26

Humerus: Distal to the tuberosities

Surgical neck

27

Humerus: Roughened area approximately halfway down the lateral aspect of shaft

Deltoid tuberosity

28

Humerus: Behind and below the deltoid tuberosity

Spiral groove for the radial nerve

29

Humerus: Articulates with head of radius

Capitulum

30

Humerus: Articulates with ulna

Trochlea

31

Humerus: Lies above the capitulum and receives the head of the radius in full flexion of elbow joint

Radial fossa

32

Humerus: Above the trochlea anteriorly, this receives the ulna during full flexion of elbow joint

Coronoid fossa

33

Humerus: Above the trochlea posteriorly, this receives the ulna when elbow is fully extended

Olecranon fossa

34

Upper end vs lower end: Head of radius

Upper

35

Radius: Articulates with the capitulum of humerus

Upper concave surface of head

36

Radius: Articulates with the radial notch of ulna

Circumference of head

37

Radius: Below the neck

Bicipital tuberosity

38

Radius: Inserts at the bicipital tuberosity

Biceps brachii

39

Radius: Attaches to the sharp interosseous border at the shaft

Interosseous membrane

40

Lateral vs medial: Styloid process of radius

Lateral

41

Radius: Articulates with head of ulna

Ulnar notch

42

Radius: Inferior surface of lower end articulates with (2)

1) Scaphoid
2) Lunate

43

Radius: Posterior surface of the lower end

Dorsal tubercle

44

Radius: Dorsal tubercle is grooved on its medial side by the tendon of

ExPoLo

45

Ulna: Large upper end that forms the prominence of the elbow

Olecranon process

46

Ulna: Lies on the anterior surface of the olecranon process

Trochlear notch

47

Ulna: Below the trochlear notch

Coronoid process

48

Ulna: On the lateral surface of the coronoid process

Radial notch

49

Upper vs lower end: Head of ulna

Lower

50

Medial vs lateral: Styloid process of ulna

Medial

51

Carpal bones: #

8

52

Carpal bones: Name in order (lat-med; proximal-distal)

Some Lovers Try Positions That They Can't Handle
1) Scaphoid (navicular)
2) Lunate
3) Triquetral
4) Pisiform
5) Trapezium
6) Trapezoid
7) Capitate
8) Hamate

53

Concavity vs convexity: Formed by carpal bones on anterior surface

Concavity

54

Carpal bones: Attached to the lateral and medial edges anteriorly

Flexor retinaculum

55

Contents of carpal tunnel (2)

1) Median nerve
2) Long flexor tendons of the fingers

56

Compressed in carpal tunnel syndrome

Median nerve

57

Flexor muscle that does not pass beneath the flexor retinaculum

Palmaris longus

58

Metacarpal bones: Form the knuckles

Heads

59

Metacarpal bones: Heads articulate with

Proximal phalanges

60

Phalanges: # per finger

3 except thumb (2)

61

Shoulder joint: Fibrocartilaginous rim that deepens the glenoid cavity

Glenoid labrum

62

Shoulder joint: Type of joint

Synovial ball-and-socket

63

Shoulder joint: Capsule strengthened by tendons of

1) Supraspinatus superiorly
2) Infraspinatus and Teres minor posteriorly
3) Subscapularis anteriorly

64

Shoulder joint: Stabilizers

Rotator cuff muscles

65

Shoulder joint: Rotator cuff muscles

SITS
1) Supraspinatus
2) Infraspinatus
3) Teres minor
4) Subscapularis

66

Shoulder joint, ligament: Strengthen the anterior part of the capsule

Glenohumeral ligaments

67

Shoulder joint, ligament: Bridges the gap between the greater and lesser tuberosities of humerus and holds tendon of long head of biceps in place

Transverse humeral ligament

68

Shoulder joint, ligament: Strengthens superior part of the capsule

Coracohumeral ligament

69

Shoulder joint, ligament: Protects the superior aspect of the joint

Coracoacromial ligament

70

Shoulder joint: The synovial membrane surrounds the tendon of

Biceps muscle

71

Shoulder joint: Synovial membrane protrudes forward through the capsule forming a bursa beneath

Subscapularis muscle

72

Shoulder joint: Weakest part

Inferior

73

Shoulder joint: Subglenoid dislocation into the quadrangular space can cause damage to what structure

Axillary nerve

74

Shoulder joint: Axillary nerve injury causes (2)

1) Paralysis of deltoid
2) Loss of skin sensation over lower half of deltoid
3) Weak lateral rotation (teres minor)

75

Shoulder joint: The quadrangular space contains (2)

1) Posterior humeral circumflex artery
2) Axillary nerve

76

Shoulder joint relations: Anterior (2)

1) Brachial plexus
2) Axillary vessels

77

Shoulder joint relations: Inferior

1) Axillary nerve
2) Posterior circumflex humeral vessels

78

Elbow: Type of joint

Synovial hinge

79

Elbow, medial vs lateral collateral ligament: Closely related to ulnar nerve

Medial

80

Elbow: Fracture/dislocation damages what nerve/vessel

Ulnar nerve

81

Elbow: Muscles that produce flexion

1) Biceps
2) Brachialis
3) Brachioradialis
4) Pronator teres

82

Elbow: Muscles that produce extension

1) Triceps
2) Anconeus

83

Elbow: Angle seen when elbow joint is extended and lies between arm and forearm

Carrying angle

84

Elbow: Carrying angle in males

170

85

Elbow: Carrying angle in females

167

86

Elbow relations: Anterior (2)

1) Median nerve
2) Brachial artery

87

Elbow relations: Medial

Ulnar nerve as it passes behind the medial epicondyle of the humerus

88

Superior radioulnar joint: Consists of

1) Circumference of radial head
2) Radial notch
3) Annular ligament

89

Superior radioulnar joint: Forms a collar around the radial head of radius

Annular ligament

90

Superior radioulnar joint: Pronation (2)

1) Pronator teres
2) Pronator quadratus

91

Superior radioulnar joint: Supination

1) Supinator muscles
2) Biceps

92

Supination vs pronation: More powerful

Supination

93

Inferior radioulnar joint: Components

1) Ulnar head
2) Ulnar notch

94

Inferior radioulnar joint: Type of joint

Synovial pivot

95

Inferior radioulnar joint: Shuts off the joint from wrist joint

Articular disc

96

Wrist joint/Radiocarpal joint: Type

Synovial condyloid

97

Wrist joint/Radiocarpal joint: Ligament/s that connect/s the styloid process of ulna to triquetral

Medial

98

Wrist joint/Radiocarpal joint: Ligament/s that connect/s the styloid process of the radius to the scaphoid bone

Lateral

99

Wrist joint/Radiocarpal joint: Nerve supply

1) Anterior interosseous nerve from median nerve
2) Deep branches of radial and ulnar nerves

100

Wrist joint/Radiocarpal joint, T/F: Rotation is possible

F

101

Wrist joint/Radiocarpal joint: Flexion (6)

1) Palmaris longus
2) Flexor carpi radialis
3) Flexor carpi ulnaris
4) Flexor digitorum superficialis
5) Flexor digitorum profundus
6) Flexor pollicis longus

102

Wrist joint/Radiocarpal joint: Extension (7)

1) Extensor carpi radialis longus
2) Extensor carpi radialis brevis
3) Extensor carpi ulnaris
4) Extensor digitorum
5) Extensor pollicis longus
6) Extensor indicis
7) Extensor digiti minimi

103

Wrist joint/Radiocarpal joint: Adduction (2)

1) Flexor carpi ulnaris
2) Extensor carpi ulnaris

104

Wrist joint/Radiocarpal joint relations: Anterior (2)

1) Median nerve
2) Ulnar nerve

105

Wrist joint/Radiocarpal joint relations: Lateral

Radial artery

106

Carpometacarpal joints: Type of joint

Synovial gliding

107

Carpometacarpal joints: Thumb, type of joint

Synovial saddle

108

Carpometacarpal joint of thumb: Flexion (2)

1) Flexor pollicis longus and brevis
2) Opponens pollicis

109

Carpometacarpal joint of thumb: Extension

Expolo and expobre

110

Carpometacarpal joint of thumb: Abduction

Abpolo and abpobre

111

Carpometacarpal joint of thumb: Adduction

Adductor pollicis

112

Carpometacarpal joint of thumb: Rotation/opposition

Opponens pollicis

113

Metacarpophalangeal joints: Type of joint

Synovial condyloid

114

Metacarpophalangeal joints: Ligaments

Palmar

115

Metacarpophalangeal joints: Flexion (4)

1) Interossei
2) Lumbricals
3) Flexor digitorum superficialis
4) Flexor digitorum profundus

116

Metacarpophalangeal joints: Extension

1) Extensor digitorum
2) Extensor indicis
3) Extensor digiti minimi

117

Metacarpophalangeal joints: Abduction (away from midline of 3rd finger)

Dorsal interossei

118

Metacarpophalangeal joints: Adduction (toward midline of 3rd finger)

Palmar interossei

119

Interphalangeal joints: Type of joint

Synovial hinge

120

Muscles connecting the upper limb to the vertebral column (5)

1) Trapezius
2) Latissimus dorsi
3) Levator scapula
4) Rhomboid minor
5) Rhomboid major

121

Muscles connecting the upper limb to the thoracic wall (4)

1) Pectoralis major
2) Pectoralis minor
3) Subclavius
4) Serratus anterior

122

Muscles connecting the scapula to the humerus (6)

1) Supraspinatus
2) Infraspinatus
3) Teres minor
4) Teres major
5) Subscapularis
6) Deltoid

123

Axilla, base: Anterior

Anterior axillary fold (inferior border of pectoralis major)
1) Pectoralis major
2) Pectoralis minor
3) Subclavius

124

Axilla, base: Posterior

Posterior axillary fold (tendon of latissimus dorsi and teres major)

125

Axilla, base: Medial

Chest wall

126

Axilla: Contents (3)

1) Axillary vessels
2) Brachial plexus
3) Lymph nodes

127

Axillary sheath: Contents

1) Axillary vessels
2) Brachial plexus

128

Axillary sheath: Continuous above with

Prevertebral layer of deep cervical fascia

129

Nerve supply: Latissimus dorsi

Thoracodorsal nerve

130

Nerve supply: Rhomboids

Dorsal scapular nerve

131

Action: Latissimus dorsi

1) Extends
2) Adducts
3) Medially rotates the arm

132

Action: Raises medial border of scapula

Levator scapula

133

Nerve supply: Serratus anterior

Long thoracic nerve

134

Nerve supply: Deltoid

Axillary nerve

135

Nerve supply: Teres minor

Axillary nerve

136

Action: Supraspinatus

Abducts arm

137

Action: Infraspinatus

Laterally rotates arm

138

Action: Teres minor

Laterally rotates arm

139

Action: Subscapularis

Medially rotates arm

140

Boundaries of quadrangular space: Superior

Subscapularis

141

Boundaries of quadrangular space: Inferior

Teres major

142

Boundaries of quadrangular space: Lateral

Surgical neck of humerus

143

Boundaries of quadrangular space: Medial

Long head of triceps

144

Cubital fossa: Shape

Triangular

145

Cubital fossa boundaries: Lateral

Brachioradialis

146

Cubital fossa boundaries: Medial

Pronator teres

147

Cubital fossa boundaries: Base

Imaginary line between two epicondyles of humerus

148

Cubital fossa contents: Superficial fascia (2)

1) Basilic
2) Cephalic

149

Forearm: Compartments

1) Anterior
2) Posterior
3) Lateral

150

Forearm: Position in function (most stable position)

Midprone

151

Forearm: Muscles of anterior compartment (8)

1) Pronator teres
2) Pronator quadratus
3) Flexor carpi radialis
4) Flexor carpi ulnaris
5) Flexor digitorum superficialis
6) Flexor digitorum profundus
7) Flexor pollicis longus
8) Palmaris longus

152

Forearm: Muscle often absent in anterior compartment

Palmaris longus

153

Forearm: Muscles of posterior compartment (10)

1) Anconeus
2) Abductor pollicis longus
3) Supinator
4) Extensor carpi radialis brevis
5) Extensor carpi ulnaris
6) Extensor digitorum
7) Extensor pollicis longus
8) Extensor pollicis brevis
9) Extensor indicis
10) Extensor digiti minimi

154

Forearm: Muscles of lateral compartment (2)

1) Brachioradialis
2) Extensor carpi radialis longus

155

Forearm, nerve supply: Lateral compartment

Radial nerve

156

Forearm, nerve supply: Posterior compartment

Deep branch of radial nerve

157

Forearm, nerve supply: Flexor carpi ulnaris

Ulnar nerve

158

Carpal tunnel: Median nerve lies between (2)

1) Flexor carpi radialis
2) Flexor digitorum superficialis

159

Hand: Palmar aponeurosis is continuous proximally with

Plamaris longus tendon

160

Hand: T/F Palmaris longus is attached to flexor retinaculum

T

161

Hand, lumbricals: #

4

162

Hand, palmar interossei: #

4

163

Hand, dorsal interossei: #

4

164

Hand, origin: Lumbricals

Tendon of flexor digitorum profundus

165

Hand, origin: Palmar interossei

1st, 2nd, 4th, and 5th metacarpals

166

Hand, origin: Dorsal interossei

Contiguous sides of 5 metacarpals

167

Hand: Muscle that inserts to the skin of the palm

Palmaris brevis

168

Hand, nerve supply: Palmar interossei

Deep branch of ulnar nerve

169

Axillary artery: Begins at

Lateral border of first rib

170

Axillary artery: Continuation of

Subclavian artery

171

Axillary artery: Becomes the ___ artery at the lower border of teres MAJOR

Brachial

172

Axillary artery: Divided into 3 parts by

Pectoralis minor

173

Axillary artery: Branches per part (#)

1,2,3

174

Axillary artery: Branch of first part

Highest thoracic

175

Axillary artery: Branches of 2nd part

1) Thoracoacromial
2) Lateral thoracic

176

Axillary artery: Branches of 3rd part

1) Subscapular
2) Anterior circumflex
3) Posterior circumflex

177

Brachial artery: End

Radial neck

178

Brachial artery: Branch to bone

Nutrient artery to humerus

179

Brachial artery: Branch that accompanies radial nerve at spiral groove

Profunda artery

180

Brachial artery: Smaller branch

Radial artery

181

Radial artery: Compartments of forearm supplied

Anterior and lateral

182

Radial artery: Joins the deep branch of ulnar artery at the palm to form the

Deep palmar arch

183

Radial artery: Superficial palmar branch joins the ulnar artery to form the

Superficial palmar arch

184

Radial artery: Branch that takes part in the arterial anastomosis around the elbow joint

Recurrent

185

Radial artery: Pulse taken between

1) Brachioradialis laterally
2) Flexor carpi radialis medially

186

Ulnar artery: Pulse

Anterior to the flexor retinaculum, lateral to the pisiform

187

Ulnar artery: Branch that takes part in the arterial anastomosis around elbow joint

Recurrent

188

Ulnar artery: Divides at the interosseous membrane

Common interosseous artery

189

Ulnar artery: Branch that joins the radial artery forming a palmar arch

Deep palmar branch

190

T/F: Ligation of arteries of upper limb causes gangrene

F

191

Pulse: Axillary artery

3rd part anterior to teres major

192

Pulse: Brachial artery

Anterior to the brachialis muscle, medial to the biceps brachii tendon

193

Superficial veins of upper limb: Drained on the lateral side by

Cephalic vein

194

Superficial veins of upper limb: Drained on medial side by

Basilic vein

195

Cephalic vein: Pierces deep fascia to join

Axillary vein

196

Basilic vein: Pierces deep fascia to join

2 venae comitantes of brachial artery to form the axillary vein

197

Superficial veins of upper limb: Connects cephalic and basilic vein

Median cubital vein

198

Median cubital vein: Location

Anterior to the bicipital aponeurosis

199

Superficial veins of upper limb: Commonly used for central venous catheterization

Basilic vein

200

Deep veins of upper limb

Venae comitantes

201

Lymphatic drainage of upper limb: All vessels ultimately drain into

Axillary nodes

202

Axillary LN: Lower border of pectoralis minor and behind pectoralis major

Anterior/pectoral

203

Lymphatic drainage of upper limb: Anterior/pectoral nodes receive lymph from

1) Lateral breast
2) Thoracoabdominal wall above umbilicus

204

Lymphatic drainage of upper limb: In front of subscapularis

Posterior/subscapular

205

Lymphatic drainage of upper limb: Posterior/subscapular nodes receive lymph from

Superficial back as far as iliac crest

206

Lymphatic drainage of upper limb: Along axillary vein

Lateral

207

Lymphatic drainage of upper limb: Lateral nodes receive lymph from

Most of the upper limb except superficial lateral side

208

Lymphatic drainage of upper limb: Center of axilla

Central

209

Lymphatic drainage of upper limb: Central nodes receive lymph from

All that drain into anterior, posterior, and lateral nodes

210

Lymphatic drainage of upper limb: Outside the axilla, between the deltoid and pectoralis major

Infraclavicular/deltopectoral

211

Lymphatic drainage of upper limb: Infraclavicular/deltopectoral nodes receive lymph from

1) Lateral side of hand
2) Forearm
3) Arm
4) Vessels that accompany the cephalic vein

212

Lymphatic drainage of upper limb: Apex of axilla

Apical

213

Lymphatic drainage of upper limb: Apical nodes receive lymph from

All other axillary nodes

214

Lymphatic drainage of upper limb: Apical nodes drain into

Subclavian trunk

215

Lymphatic drainage of upper limb: Superficial fascia in the cubital fossa

Supratrochlear/cubital

216

Lymphatic drainage of upper limb: Supratrochlear/cubital node receives lymph from

1) Medial fingers
2) Medial hand
3) Medial forearm

217

Brachial plexus: Roots enter the base of neck between

Scalenus anterior and scalenus medius

218

Brachial plexus: Trunks and division cross the

Posterior triangle of the neck

219

Brachial plexus: Cords are arranged around the

Axillary artery

220

Brachial plexus: Divided into

1) Roots
2) Trunks
3) Divisions
4) Cords

221

Posterior cords of C5,6 and 7 form

Long thoracic nerve

222

Brachial plexus: Trunks

1) Superior
2) Middle
3) Inferior

223

Brachial plexus: Divisions

1) Anterior
2) Posterior

224

Brachial plexus: Cords

1) Lateral
2) Posterior
3) Medial

225

Brachial plexus: Branches

1) Musculocutaneous
2) Axillary
3) Median
4) Radial
5) Ulnar

226

Brachial plexus: Superior trunk is formed by

C5,6

227

Brachial plexus: Middle trunk is formed by

C7

228

Brachial plexus: Inferior trunk is formed by

C8, T1

229

Brachial plexus: Lateral cord is formed by

Anterior divisions of superior and middle trunks

230

Brachial plexus: Posterior cord is formed by

Posterior divisions of superior, middle, and inferior trunks

231

Brachial plexus: Medial cord is formed by

Anterior division of inferior trunk

232

Brachial plexus: Branches of lateral cord (3)

1) Musculocutaneous
2) Lateral pectoral
3) Median (as it joins with medial cord)

233

Brachial plexus: Branches of superior trunk (2)

1) Suprascapular nerve
2) Nerve to subclavius

234

Brachial plexus: Branches of posterior cord (5)

1) Radial nerve
2) Axillary nerve
3) Upper subscapular
4) Lower subscapular
5) Thoracodorsal

235

Brachial plexus: Branches of medial cord

1) Ulnar nerve
2) Medial pectoral
3) Medial cutaneous of arm
4) Medial cutaneous of forearm

236

Brachial plexus, supplies: Long thoracic

Serratus anterior

237

Brachial plexus, supplies: Dorsal scapular

1) Rhomboids
2) Levator scapula

238

Brachial plexus, supplies: Suprascapular

1) Supraspinatus
2) Infraspinatus

239

Brachial plexus, supplies: Lateral pectoral

Pectoralis major

240

Brachial plexus, supplies: Upper subscapular

Subscapularis

241

Brachial plexus, supplies: Lower subscapular

Subscapularis and teres major

242

Brachial plexus, supplies: Thoracodorsal

Latissimus dorsi

243

Brachial plexus, supplies: Axillary nerve

1) Deltoid
2) Teres minor
3) Skin over lower half of deltoid

244

Brachial plexus, supplies: Radial nerve

1) Posterior compartment of arm
2) Posterior compartment of forearm (Deep radial branch)
3) Skin on lateral side of dorsum of hand and dorsal surface of lateral 3 1/2 fingers

245

Brachial plexus, supplies: Medial pectoral nerve

Pectoralis major and minor

246

Brachial plexus, supplies: Ulnar nerve

1) Interossei
2) Hypothenar eminence
3) 3rd and 4th lumbricals
4) Skin of medial half of dorsum and palm
5) Skin of dorsal and palmar surfaces of medial 1 1/2 fingers

247

Brachial plexus, supplies: Median nerve

1) Pronators
2) 3 thenar
3) First 2 lumbricals
4) Skin of lateral half of palm and palmar surface of lateral 3 1/2 fingers

248

Brachial plexus: Ulnar nerve in the upper arm (compartment)

Anterior

249

Brachial plexus: Ulnar nerve pierces

Medial intermuscular septum of arm

250

Brachial plexus: Ulnar nerve relation to ulnar artery in the forearm

Medial to the ulnar artery

251

Brachial plexus: Radial nerve pierces

Lateral intermuscular septum

252

Brachial plexus lesions: Displacement of head to opposite side and depression of shoulder on same side

Superior trunk lesion aka Erb-Duchenne Palsy aka Waiter's tip hand

253

Brachial plexus lesions: Traction injury as in excessive abduction

Inferior trunk lesion aka Klumpke Palsy aka Claw hand

254

Brachial plexus lesions: Blow or surgical injury to this nerve at the axilla

Long thoracic nerve lesion aka serratus anterior paralysis or Winged scapula aka Difficulty of raising arm above head

255

Brachial plexus lesions: Inferior dislocation of shoulder of fracture of surgical neck of humerus

Axillary nerve lesion aka deltoid paralysis and loss of sensation at skin over lower half of deltoid

256

Brachial plexus lesions: Fracture of midshaft of humerus

Radial nerve lesion aka wrist drop

257

Brachial plexus lesions: Supracondylar fracture of humerus or wounds proximal to flexor retinaculum

Median nerve lesion aka thenar paralysis aka apelike hand

258

Brachial plexus lesions: Claw deformity

Ulnar nerve lesion

259

Radial nerve: First branch

Recurrent branch

260

Radial nerve: Recurrent branch anastomoses with

Radial collateral artery

261

Cubital fossa contents: Medial to lateral (4)

1) Median nerve
2) Bifurcation of brachial artery into ulnar and radial
3) Biceps tendon
4) Radial nerve

262

Ulnar artery: Supplies which forearm compartment

Anterior

263

Cephalic vein: Fairly constant location

Posterior to styloid process of radius

264

Brachial plexus: Formed by

Anterior rami of C5,6,7,8 and T1

265

Brachial plexus, supplies: Musculocutaneous

1) Anterior compartment of upper arm
2) Skin along lateral border of forearm (lateral cutaneous nerve of forearm)

266

Brachial plexus: Musculocutaneous nerve pierces

Coracobrachialis muscle and deep fascia