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.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.