TABLE 10-5. INNERVATION OF CLINICALLY IMPORTANT MUSCLES.

Movement tested Main muscles Nerve roots Peripheral nerve

Shoulder

     
Shrug (elevation) Trapezius C2-5 Spinal accessory
Abduction Deltoid/supraspinatus C5(6) Axillary/suprascapular
External rotation Infraspinatus/teres C5(6) Suprascapular
Internal rotation Pectoralis major C5-7 Lateral pectoral
Adduction Latissimus/pectoralis C6-8 Suprascapular/pectoral
Flexion Deltoid/coracobr. C5-6 Axillary/musculocut.

Elbow

     
Flexion Biceps/brachialis
Brachioradialis
C5-6
C5-6
Musculocutaneous
Radial
Extension Triceps C6-7 Radial

Wrist

     
Flexion Flexor carpi radialis
Flexor carpi ulnaris
C6-7
C7-8
Median
Ulnar
Extension Extensor carpi radialis
Ext. carpi ulnaris
C6-7
C7-8
Radial
Deep radial
Pronation Pronator teres C6-7 Median
Supination Supinator
Biceps
C5-6
C5-6
Radial
Musculocutaneous

Finger

     
Flexion Flexor digitorum mm. C7-8 Median (ulnar)
Extension Extensor digitorum C7-8 Deep Radial
Ab- & Adduction Interosseous muscles C8-T1 Ulnar
Thumb abduction Abductor pollicis br. C8-T1 Median

Hip

     
Flexion Iliopsoas L2-3 (L4) Lumbar plexus
Extension Gluteus max L5-S2 Inferior gluteal
Abduction Gluteus medius L5-S1 Superior gluteal
Adduction Adductor mm. L2-4 Obturator

Knee

     
Flexion Hamstring L5-S1 Sciatic
Extension Quadriceps L2-4 Femoral

Ankle

     
Dorsiflexion Tibialis anterior L4-5 (S1) Fibular (peroneal)
Plantar flexion Gastroc/soleus S1 (S2) Tibial
Inversion Posterior tibial L5 (S1) Tibial
Eversion Fibular (peroneal) L5 (S1) Fibular (peroneal)

Great toe

     
Dorsiflexion Extensor hallucis L5 (S1) Fibular (peroneal)
Plantar flexion Flexor hallucis (S1) S2 Tibial
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