Lateral view of the parahippocampal region. The parahippocampal gyrus is the inferomedial gyrus of the temporal lobe containing the uncus. The band of Giacomini represents the inferior surface of the uncus, and the ambiens gyrus is an anatomic prominence of the medial temporal lobe at the rostral part of the parahippocampal gyrus. The semilunar gyrus, another anatomic prominence, covers the cortical nucleus of the amygdala. The dentate gyrus of the hippocampus lies along the outer curvature of the fimbria of the fornix. Just above the fimbria is the lateral geniculate nucleus of the thalamus. Note the proximity of the lateral geniculate nucleus to the inferior choroidal point, where the anterior choroidal artery enters the temporal horn. The collateral sulcus (fissure) runs the length of the temporal lobe and separates the parahippocampal gyrus from the fusiform gyrus. (Image courtesy of AL Rhoton, Jr.)