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subthalamus

(sŭb-thălə-məs)
n.
  1. The part of the diencephalon that is wedged ventrally between the thalamus on the dorsal side and the cerebral peduncle, is lateral to the dorsal half of the hypothalamus, and is caudally continuous with the mesencephalic tegmentum.
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Related formssub′tha•lamic (-thə-lămĭk) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.