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A plexus is a network. It has more specific meanings in multiple fields.


In biology it has multiple meanings.

Nervous systemEdit

In many animals the processes of neurons join together to form a plexus or nerve net. This is a characteristic form of nervous system .

In vertebrates nerves branch and rejoin in some parts of the body, for example the brachial plexus made up of the spinal nerves which enter the arm and the solar plexus above the stomach.

Almost a hundred such plexuses have been named in the human body, but the four primary nerve plexuses are the cervical plexus, brachial plexus, lumbar plexus, and the sacral plexus.

Circulatory systemEdit

A plexus is also a network of blood vessels, with the choroid plexuses of the brain being the most commonly mentioned example. Choroid plexuses are very thin and vascular roof plates of the most anterior and most posterior cavities of the brain which expand into the interiors of the cavities. Other vascular plexuses are found elsewhere in the body.

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