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from Wikipedia, the free encyclopedia

Motor neuron

In vertebrates, motor neurons (also called motoneurons) are efferent neurons that originate in the spinal cord and synapse with muscle fibers to facilitate muscle contraction and with muscle spindles to modify proprioceptive sensitivity.

Note:   The above text is excerpted from the Wikipedia article "Motor neuron", which has been released under the GNU Free Documentation License.
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September 1, 2015

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updated 12:56 pm ET