TABLE 10-5. INNERVATION OF CLINICALLY IMPORTANT MUSCLES.
| Movement tested | Main muscles | Nerve roots | Peripheral nerve |
|---|---|---|---|
Shoulder |
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| 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 |
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| Flexion | Biceps/brachialis Brachioradialis |
C5-6 C5-6 |
Musculocutaneous Radial |
| Extension | Triceps | C6-7 | Radial |
Wrist |
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| 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 |
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| 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 |
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| 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 |
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| Flexion | Hamstring | L5-S1 | Sciatic |
| Extension | Quadriceps | L2-4 | Femoral |
Ankle |
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| 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 |
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| Dorsiflexion | Extensor hallucis | L5 (S1) | Fibular (peroneal) |
| Plantar flexion | Flexor hallucis | (S1) S2 | Tibial |
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