Neuromuscular

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Innervation of upper extremity muscles

Roots
  Root lesions

Brachial plexus
  Hereditary
  Acquired

Legs
Nerves
Axillary
Dorsal scapular
Long thoracic
Median
  Anterior interosseus 
  Martin-Gruber
Musculocutaneous
Radial
  Posterior interosseus
  Superficial radial
Spinal accessory
Suprascapular
Ulnar

Root, Brachial plexus and Nerve components

Roots1 Trunks Cords
Muscle Nerve C4 C5 C6 C7 C8 T1 Sup Med Inf Lat Post Med
Trapezius Spinal accessory + . . . . . + . . . . .
Rhomboid Dorsal scapular + + . . . . + . . . . .
Supraspinatus Suprascapular . + + . . . + . . . . .
Infraspinatus Suprascapular . + + . . . + . . . . .
Deltoid Axillary . + + . . . + . . . + .
Teres minor Axillary . + + . . . + . . . + .
Biceps Musculocutaneous . + + . . . + . . + . .
Brachioradialis Radial . + + . . . + . . . + .
Pectoralis major upper Lateral Pectoral . + + + + . . . . + . .
Pectoralis minor Medial Pectoral . . . + + . . . . . . +
Serratus anterior Long thoracic . + + + . . . . . . . .
Supinator Radial . . + . . . + . . . + .
Pronator teres Median . . + + . . + . . + . .
Latissimus dorsi Thoracodorsal . . + + + . . + . . + .
Teres major Lower subscapular . + + + . . . . . . + .
Extensor digitorum Radial . . ± + + . . + . . + .
Flexor carpi radialis Median . . + + . . . + . + . .
Pronator quadratus Anterior Interosseus . . . + + + . + + + . +
Flexor digitorum profundus Anterior Interosseus
Ulnar		 . . . + + + . + + + . +
Triceps Radial . . + + + . . + . . + .
Extensor indicis Radial . . . + + + . . + . + .
Dorsal interosseus I Ulnar . . . . + + . . + . . +
Abductor pollicis brevis Median . . . . + + . . + . . +
Paraspinal Cervical + + + + + + . . . . . .
Muscle Nerve C4 C5 C6 C7 C8 T1 Sup Med Inf Lat Post Med
Sup = Superior; Inf = Inferior; Med = Medial; Lat = Lateral; Post = Posterior


Muscles innervated by 2 nerves

CERVICAL ROOT LESIONS: CLINICAL FEATURES
Root Motor Involvement Sensory Loss Pain Location Deep Tendon Reflex
C4 None Shoulder
Arm, Upper		 Neck, upper Normal
C5 Shoulder abduction
Elbow flexion		 Arm, Lateral Neck; Shoulder
Scapula
Arm, Anterior		 Biceps
Brachioradialis
C6 Shoulder abduction
Elbow flexion
Forearm pronation		 Forearm, Lateral
Hand, Thumb & 2nd finger		 Neck; Shoulder
Scapula
Arm, Lateral
Hand, Lateral		 Biceps
Brachioradialis
Pronator
C7 Extension
  Elbow & Wrist		 Forearm; Dorsal & Lateral
Hand, 3rd finger		 Neck; Shoulder
Scapula, Medial
Forearm, Extensor		 Triceps
C8 Hand, intrinsic Forearm; Medial
Hand, 4th & 5th fingers		 Neck
Scapula, Medial
Arm, Medial
Forearm, Medial
Hand, 4th & 5th fingers		 None

Frequency of nerve root lesions

Spurling maneuver


Nerve anatomy
  Other

Brachial plexus
Upper extremity weakness
Legs
External links
  Brachial plexus map
  Cutaneous fields

Muscle Anatomy
  External links

Shoulder
Arm
Forearm
Wrist


Go to: Lower extremity innervation
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8/12/2008

1. Neurology 1996;46:1022-1025