hippocampus /hip′ōkam″pəs/ pl. hippocampi [Gk, hippokampos, seahorse] , a curved convoluted elevation of the floor of the inferior horn of the lateral ventricle of the brain. It is composed of gray substance covered by a layer of white fibers, the alveus, and functions as an important component of the limbic system and of memory processing. Its efferent projections form the fornix of the cerebrum. Also called Ammon’s horn, hippocampus major.
