Tanycytes

Tanycytes are one of the three types of ependymal cells, themselves a type of glial cell. They are found lining the floor of the third ventricle overlying the median eminence of the hypothalamus .

It is believed that these specialized cells are involved in the feedback mechanisms on the anterior pituitary gland, able to transport certain chemicals from the cerebrospinal fluid to the regional capillaries that then drain into the portal hypophyseal circulation .