Reference Terms
from Wikipedia, the free encyclopedia

Peripheral nervous system

The peripheral nervous system or PNS, is part of the nervous system, and consists of the nerves and neurons that reside or extend outside the central nervous system (the brain and spinal cord) to serve the limbs and organs, for example.

Unlike the central nervous system, however, the PNS is not protected by bone or the blood-brain barrier, leaving it exposed to toxins and mechanical injuries.

The peripheral nervous system is divided into the somatic nervous system and the autonomic nervous system.

Note:   The above text is excerpted from the Wikipedia article "Peripheral nervous system", which has been released under the GNU Free Documentation License.
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October 10, 2015

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