part of infundibulum median eminence 1. A raised area in the floor of the third ventricle of the brain produced by the infundibulum of the hypothalamus. 2. The median eminence is sometimes classified as part of the neurohypophysis. It serves as a reservoir for the hypothalamic neurohormones vasopressin, oxytocin, and the neurophysins, releasing them as needed. It originates in the embryo as an evagination from the floor of the diencephalon. BTO:0001954 BrendaTissueOBO