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Branches of the Brachial Plexus and their Distribution
Roots
Dorsal scapular nerve (C5)
Rhomboid minor
Rhomboid major
Levator scapulae muscles
Long thoracic nerve (C5, 6, 7)
Serratus anterior muscle
Upper Trunk
Suprascapular nerve (C5, 6)
Supraspinatus
Infraspinatus muscles
Nerve to subclavius (C5, 6)
Subclavius
Lateral Cord
Lateral pectoral nerve (C5, 6, 7)
Pectoralis major muscle
Musculocutaneous nerve (C5, 6, 7)
Coracobrachialis,
Biceps brachii,
Brachialis muscles;
Supplies skin along lateral border of forearm when it becomes the lateral cutaneous nerve of forearm
Lateral root of median nerve (C5, 6, 7)
See medial root of median nerve
Posterior Cord
Upper subscapular nerve (C5, 6)
Subscapularis muscle
Thoracodorsal nerve (C6, 7, 8)
Latissimus dorsi muscle
Lower subscapular nerve (C5, 6)
Subscapularis
Teres major muscles
Axillary nerve (C5, 6)
Deltoid and
Teres minor muscles;
Upper lateral cutaneous nerve of arm supplies skin over lower half of deltoid muscle
Radial nerve (C5, 6, 7, 8; T1)
Triceps,
Anconeus,
Part of brachialis,
Extensor carpi radialis longus;
via deep radial nerve branch supplies
Extensor muscles of forearm: supinator, extensor carpi radialis brevis, extensor carpi ulnaris, extensor digitorum, extensor digiti minimi, extensor indicis, abductor pollicis longus, extensor pollicis longus, extensor pollicis brevis;
skin
Lower lateral cutaneous nerve of arm
Posterior cutaneous nerve of arm
Posterior cutaneous nerve of forearm
Skin on lateral side of dorsum of hand and
Dorsal surface of lateral three and a half fingers
Articular branches to elbow, wrist, and hand
Medial Cord
Medial pectoral nerve (C8; T1)
Pectoralis major and minor muscles
Medial cutaneous nerve of arm joined by intercostal brachial nerve from second intercostal nerve (C8; T1, 2)
Skin of medial side of arm
Medial cutaneous nerve of forearm (C8; T1)
Skin of medial side of forearm
Ulnar nerve (C8; T1)
Flexor carpi ulnaris
Medial half of flexor digitorum profundus
Flexor digiti minimi
Opponens digiti minimi
Abductor digiti minimi
Adductor pollicis
Third and fourth lumbricals
Interossei, palmaris brevis
Skin of medial half of dorsum of hand and palm
Skin of palmar and dorsal surfaces of medial one and a half fingers
Medial root of median nerve (with lateral root) forms median nerve (C5, 6, 7, 8; T1)
Pronator teres
Flexor carpi radialis
Palmaris longus
Flexor digitorum superficialis
Abductor pollicis brevis
Flexor pollicis brevis
Opponens pollicis
First two lumbricals (by way of anterior interosseous branch)
Flexor pollicis longus
Flexor digitorum profundus (lateral half)
Pronator quadratus
Palmar cutaneous branch to lateral half of palm and digital branches to palmar surface of lateral three and a half fingers
Articular branches to elbow, wrist, and carpal joints
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