| 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 |
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.