The lateral tuberal nucleus (LTN) is a hypothalamic region that has been identified with certainty only in humans and primates. It is composed of three small round globular units which protrude the basal surface of the brain along the optic tract. The function of the LTN is unknown. Recently, a tiny, parvalbumin-positive (PV1) nucleus was detected in the lateral hypothalamus of rodents. Like the...