mamillary body

Medical Dictionary

mamillary body n.
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.

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

noun
one of two small round structures on the undersurface of the brain that form the terminals of the anterior arches of the fornix 
WordNet® 3.0, © 2006 by Princeton University.
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