Plexus
From Free net encyclopedia
- For other uses, see Plexus (disambiguation).
Template:Wiktionarypar A plexus is a network. It has more specific meanings in multiple fields.
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Biology
In biology it has multiple meanings.
Nervous system
In many animals the processes of neurons join together to form a plexus or nerve net. This is the characteristic form of nervous system in the coelenterates and persists with modifications in the flatworms. The nerves of the radially symmetric echinoderms also take this form, where a plexus underlies the ectoderm of these animals and deeper in the body other nerve cells form plexuses of limited extent.
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 system
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.
Business
Plexus is also the generic name of any extremely powerful group within a corporation, or an association of corporations, whose work is done in secret. Groups of this nature usually wield power in secret to subvert national or international laws, morals or ethics. Members of the group typically are only known by other members. Template:Citeneededes:Plexo fr:Plexus pt:Plexo