part of derives from/develops from ependymocyte tanycyte BTO:0001953 BrendaTissueOBO Modified ependymal cell of the median eminence, having a body that lies near the third ventricle and sending out processes that extend to the capillary plexus of the portal circulation. Its function is unknown, but it may transport hormones from the cerebrospinal fluid into the portal circulation or from hypothalamic neurons to the cerebrospinal fluid. median eminence