Appendix C: Spinal Nerves and Plexuses

Motor and sensory levels of the spinal cord.

The cervical plexus.

The brachial plexus.

Segmental innervation of the right upper extremity, anterior view.

Segmental innervation of the right upper extremity, posterior view.

Musculocutaneous (C5, 6) and axillary (C5, 6) nerves.

The radial nerve (C6–8; T1).

The median nerve (C6–8; T1).

The ulnar nerve (C8, T1).

The lumbar plexus.

The femoral (L2–4) and obturator (L2–4) nerves.

The sacral plexus.

Segmental innervation of the right lower extremity, anterior view. Note the similarity between dermatomes (on left) and myotomes (on right).

Segmental innervation of the right lower extremity, posterior view.

The sciatic nerve (L4, 5; S1–3).

The common peroneal nerve (L4, 5; S1, 2).

The tibial nerve (L4, 5; S1–3).

The pudendal and coccygeal plexuses.