The mammillary bodies (mamillary bodies) are a pair of small round bodies located on the undersurface of the brain that as part of the diencephalon form part of the limbic system. They are located at the ends of the anterior arches of the fornix. They consist of two groups of nuclei the medial mammillary nuclei and the lateral mammillary nuclei.Neuroanatomists have often categorized the mammillary bodies as part of the hypothalamus.
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