NERVOUSSYSTEM

Nervous system

The nervous system is the part of an animal's body that coordinates the voluntary and involuntary actions of the animal and transmits signals between different parts of its body. Nervous tissue first arose in wormlike organisms about 550 to 600 million years ago. In most types of animals it consists of two main parts, the central nervous system and the peripheral nervous system . The CNS contains the brain and spinal cord. The PNS consists mainly of nerves, which are long fibers that connect the CNS to every other part of the body. The PNS includes motor neurons, mediating voluntary movement, the autonomic nervous system, comprising the sympathetic nervous system ...

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nervous system

Noun

  1. An organ system that coordinates the activities of muscles, monitors organs, constructs and processes data received from the senses and initiates actions.


The above text is a snippet from Wiktionary: nervous system
and as such is available under the Creative Commons Attribution/Share-Alike License.

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