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A nerve plexus is a network of intersecting nerves that serve the same part of the body.
Describe nerve plexuses in the peripheral nervous system
Nerve plexuses throughout the body tend to be named after the area in which the plexus occurs and the organs, limbs, and tissues it serves. Examples include the cervical, brachial, lumbar, sacral, celiac, and coccygeal plexuses.
Auerbach's plexus, which serves the gastrointestinal tract, is named after the first person to describe this plexus, Leopold Auerbach, rather than the area of the body it serves.
The brachial plexus serves the chest, shoulders, arms and hands and is formed by the ventral rami of C5, C8, and T1 spinal nerves, and the lower and upper halves of the C4 and T2 spinal nerves.
A network of nerve fibers, running from the spine, formed by the ventral rami of the lower four cervical and first thoracic nerve roots (C5–C8, T1). It proceeds through the neck, the axilla (armpit region), and into the arm. It also supplies the brachium, the antebrachium, and the hand.
A nerve plexus is a network of intersecting nerves; multiple nerve plexuses exist in the body.
Nerve plexuses are composed of afferent and efferent fibers that arise
from the merging of the anterior rami of spinal nerves and blood
There are five spinal nerve plexuses—except in the thoracic region—as well as other forms of autonomic plexuses, many of which are a part of the enteric nervous system.
Cervical Plexus—Serves the Head, Neck and Shoulders
The cervical plexus is formed by the ventral rami of the upper four cervical nerves and the upper part of fifth cervical ventral ramus. The network of rami is located deep within the neck.
Brachial Plexus—Serves the Chest, Shoulders, Arms and Hands
The brachial plexus is formed by the ventral rami of C5–C8 and the T1 spinal nerves, and lower and upper halves of the C4 and T2 spinal nerves. The plexus extends toward the armpit (axilla).
Lumbar Plexus—Serves the Back, Abdomen, Groin, Thighs, Knees, and Calves
The lumbar plexus is formed by the ventral rami of L1–L5 spinal nerves with a contribution of T12 form the lumbar plexus. This plexus lies within the psoas major muscle.
Sacral Plexus—Serves the Pelvis, Buttocks, Genitals, Thighs, Calves, and Feet