The anterior rami of the spinal nerves form nerve plexuses in all regions except the Thoracic region.
The cervical plexus is made up of the upper cervical spinal nerves' anterior rami (supplies the anterior neck). The brachial plexus is made up of the first thoracic and lower cervical anterior rami (supplies upper limb). The lumbosacral plexus is made up of the upper and lower anterior rami of the sacrum (supplies lower limb).
A nerve plexus is a network of nerves that cross each other. The anterior rami of spinal nerves and blood arteries merge to form a nerve plexus, which is made up of afferent and efferent fibers. There are various types of autonomic plexuses, many of which are a component of the enteric nervous system, including five spinal nerve plexuses, with the exception of the thoracic area.
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