[TA] a shallow groove between the dentate gyrus and the parahippocampal gyrus; the remains of a fissure extending deep into the hippocampus between the Ammon horn and the dentate gyrus, which becomes obliterated during fetal development. SYN: sulcus hippocampalis [TA], dentate fissure, fissura dentata, fissura hippocampi, hippocampal fissure.
