Superior view of the left parahippocampal region. The parahippocampal gyrus is the inferomedial gyrus of the temporal lobe containing the uncus (uncinate gyrus). 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. Within the lateral ventricle, a prominence termed the collateral eminence is the intraventricular representation of the collateral fissure. Anteriorly, the tentorial edge forms a fold termed the petroclival ligament which bridges to the anterior clinoid process above the oculomotor nerve. (Image courtesy of AL Rhoton, Jr.)