mammillary body

noun1

1. •
   One of a pair of small round bodies, located on the undersurface of the human brain, that act as a relay for impulses coming from the amygdalae and hippocampi to the thalamus, and (as part of the diencephalon) form part of the limbic system.

   • The mammillary body is the most posterior part of the hypothalamus; there exist medially large and small cell divisions. — 2004