These functions include muscle contraction, the maintenance of body coordination and control, and the reaction to sensations such as heat, cold, pain, and pressure.

The nerves (containing motor and sensory fibers) to the shoulder and to the upper limb emerge from the brachial plexus.

The intercostal nerves that give rami to the chest and to the upper parts of the abdominal wall efferent motor innervation and to the pleura and peritoneum afferent sensory innervation are the only ones that do not originate from a plexus.

The ventral rami of L1–L5 spinal nerves with a contribution of T12 form lumbar plexus.

Nervi of the plexus serve the skin and the muscles of the lower abdominal wall, the thigh and external genitals.

It supplies anterior muscles of the thigh and a part of skin distal to the inguinal ligament.

Ventral rami of L4–S3 with parts of L4 and S4 spinal nerves form the sacral plexus.

It is located on the posterior wall of pelvic cavity (pelvis minor).

Nervi of the plexus innervate the perineal region, buttocks and the lower limb.