| Muscle | Innervation | Clinical test |
|---|---|---|
| Deltoid | Axillary (C5, C6) | Shoulder abduction |
| Supraspinatus | Suprascapular (C5, C6) | “Full can” abduction* |
| Infraspinatus | Suprascapular (C5, C6) | External rotation |
| Biceps brachii | Musculocutaneous (C5, C6) | Elbow flexion |
| Pronator teres | Median (C6, C7) | Forearm pronation |
| Triceps brachii | Radial (C7, C8) | Elbow extension |
| Abductor digiti minimi | Ulnar (C8, T1) | Fifth digit abduction |