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lumbar splanchnic nerve

n.
  1. Any of the branches from the lumbar sympathetic trunks that pass anteriorly to join the celiac, intermesenteric, aortic, and superior hypogastric plexuses.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.