, pl. unci [TA] (1) Any hook-shaped process or structure. (2) The anterior, hooked extremity of the parahippocampal gyrus on the basomedial surface of the temporal lobe; the anterior face of the uncus corresponds to the olfactory cortex, its ventral surface to the entorhinal area; deep to the uncus lies the amygdala (amygdaloid body). SYN: uncinate gyrus, uncus gyri parahippocampalis. [L. a hook, fr. G. onkos]