The term forebrain refers to one ot three components of the brain as defined in the Classical model by dissection. The other components are the midbrain and the hindbrain.The most anterior of the three, its caudal boundary is with the midbrain: a nominally coronal plane defined by the rostral margin of the superior colliculus dorsally and the caudal margin of the mammillary body ventrally. The forebrain is composed of two parts: the endbrain and the interbrain. Substructures of the forebrain are derived for the most part, but not entirely, from the embryonic Prosencephalon. It is found in the human, macaque, rat, and mouse ( NeuroNames ).