[TA] a narrow sharp-edged crest of white fiber matter, continuous with the alveus hippocampi, attached to the medial border of the hippocampus; composed of efferent fibers of the hippocampus that form the fornix, fibers of the hippocampal commissure, and septohippocampal fibers. SYN: fimbria of hippocampus [TA], corpus fimbriatum (1), tenia hippocampi.