Inferior view of cerebral hemisphere with hippocampus exposed.  The olfactory tract lies on the inferior surface of the frontal lobe between the gyrus rectus and the medial orbitary gyrus. The olfactory tract divides posteriorly into the medial and lateral olfactory striae, which are located just anterior to the anterior perforated substance. The inferior surface of the temporal lobe consists of the parahippocampal gyrus medially, the occipitotemporal gyrus, and the inferior temporal gyrus laterally.  A portion of the parahippocampal gyrus has been removed to expose the hippocampus and choroid plexus within the temporal horn of the lateral ventricle. The uncus is a hook-like projection on the medial aspect of the parahippocampal gyrus adjacent to the mesencephalon. (Image courtesy of AL Rhoton, Jr.)