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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
Also see
  Arm weakness at disease onset
  Proximal arm weakness


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 (20%)
Neck; Shoulder
Scapula
Arm, Lateral
Hand, Lateral
Biceps
Brachioradialis
Pronator
C7 Extension
  Elbow & Wrist
Forearm; Dorsal & Lateral
Hand, 3rd finger,
2nd finger (80%)
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
T1 Hand, intrinsic Forearm, Medial Forearm, Medial 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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7/19/2013

1. Neurology 1996;46:1022-1025