This area is bounded medially by the mammillothalamic tract and the anterior column of fornix. The medial edge of the internal capsule and the subthalamic region form its lateral boundary. It contains the lateral hypothalamic nucleus, tuberomammillary nucleus, lateral tuberal nuclei, and fibers of the medial forebrain bundle. (Parent, Carpenter's Human Neuroanatomy, 9th ed, p710) [MeSH]