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mamillary body

n.
  1. A small round paired cell group that protrudes into the interpeduncular fossa from the inferior aspect of the hypothalamus, receives a major bundle of hippocampal fibers from the fornix, and projects fibers to the anterior thalamic nuclei and into the tegmentum of the brainstem.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.