Segment-pointer muscles*
| Root | Muscle(s) |
|---|---|
| C3 | Diaphragm |
| C4 | Diaphragm |
| C5 | Deltoid, biceps |
| C6 | Brachioradialis, extensor carpi radialis longus |
| C7 | Triceps, extensor carpi ulnaris, extensor digitorum |
| C8 | Wrist and finger flexors |
| T1 | Intrinsic muscles of the hand |
| L3 | Quadriceps femoris |
| L4 | Quadriceps femoris, tibialis anterior |
| L5 | Extensor hallucis longus |
| S1 | Gastrocnemius |
↵* Most muscles are innervated by fibres from more than one root. However, in these examples, only one or two roots predominate for a particular muscle, aiding lesion localisation. The root values assume that the plexus is neither pre- nor post-fixed.