Encyclopedia > Nerve

  Article Content

Nerve

A nerve is an enclosed, cable-like bundle of nerve fibers or axons, which includes the glia that ensheath the axons in myelin.

Nerves are part of the peripheral nervous system. Afferent nerves convey sensory signals to the brain, for example from skin or organs, while efferent nerves conduct stimulatory signals from the brain to the muscles and glands.

These signals, sometimes called nerve impulses, are also known as action potentials: Rapidly traveling electrical waves, which begin typically in the cell body of a neuron and propagate rapidly down the axon to its tip or "terminus."

Nerves may contain fibers that all serve the same purpose; for example motor nerves, the axons of which all terminate on muscle fibers and stimulate contraction. Or they be mixed nerves.



All Wikipedia text is available under the terms of the GNU Free Documentation License

 
  Search Encyclopedia

Search over one million articles, find something about almost anything!
 
 
  
  Featured Article
Father Damien

... May 10, 1873, at his request, he was permitted to travel to Molokai to help the lepers who had virtually nothing to keep them warm or fed. After twelve years of ...

 
 
 
This page was created in 34.2 ms