Name the important nerves that arise from the cervical, brachial, lumbar and cervical plexuses and state what each of these nerves innervates.
Cervical: C1-C5; innervates skin and muscles of head, neck, shoulder; Phrenic Nerve is most important (supplies diaphragm)
Brachial: C5-C8 & T1; innervates muscles and skin of upper limbs; Major nerves it innervates = Axillary (deltoid and teres minor), Musculocutaneous (muscle on anterior arm), Median (muscles on anterior forearm and hand, Radial (muscles on posterior arm and forearm), Ulnar (muscles on medial forearm and hand)
Lumbar: L1-L4; innervates skind and muscles of abdomen, pelvis, partial lower limbs; Major nerves it innervates = Femoral (flexor muscles of thigh and extensor muscles of legs), Obturator (adductor muscles)
- Sacral: L4-L5 & S1-S4; innervates skin and muscles of butt, perineum, lower limbs; Major nerves it innervates = Pudendal (muscles of perineum), Sciatic (two nerves tibial
- and common fibular bound together by connective tissue), Tibial (supplies muscles of posterior and lateral leg), Common Fibular (supplies muscles of
- anterior leg and foot)