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Muscle groups with their corresponding innervating nerve roots
| Muscle group | Nerve root |
|---|---|
| Deltoid | C5 |
| Biceps | C5/6 |
| Infraspinatus | C5/6 |
| Subscapularis | C5/C6/C7/C8/T1 |
| Supinator | C5/6 |
| Pronator | C6 |
| Wrist extensor | C6 |
| Triceps | C7 |
| Wrist flexor | C7 |
| Extensor digitorum muscle | C7,8 |
| Interosseous | C8/T1 |
| Opponens | C8/T1 |
| Adductor pollicis brevis | C8/T1 |
| Flexor pollicis brevis | C8/T1 |
