Temporal horn of the lateral ventricle and parahippocampal region. For orientation, the top of this image is medial and the left side of the image is anterior. The parahippocampal gyrus is the inferior and medial gyrus of the temporal lobe which contains the uncus and is part of the limbic system. Between the parahippocampal gyrus and the hippocampus lies the fimbria of the fornix. The amygdala lies anterior and superior to the hippocampus at the medial aspect of the temporal lobe. The collateral eminence of the temporal horn corresponds to the medial part of the collateral fissure and is an eminence that lies lateral to and parallel with the hippocampus. Posteriorly within the temporal portion of the lateral ventricle is an eminence called the calcar avis, an involution of the wall of the lateral ventricle produced by the calcarine fissure. (Image courtesy of AL Rhoton, Jr.)