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metameric nervous system

n.
  1. The part of the nervous system innervating the body structures that develop in ontogeny from the segmentally arranged somites or from the branchial arches in the head.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.