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interpeduncular nucleus

n.
  1. A median ovoid cell group at the base of the midbrain tegmentum between the left and right cerebral peduncles, receiving the retroflex fasciculus from the habenula and projecting to the raphe nuclei and the central gray substance of the midbrain.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.