rhinal sulcus rhinal sulcus in the human brain, the entorhinal cortex appears as a longitudinal elevation anterior to the parahippocampal gyrus, with a corresponding internal furrow, the external rhinal sulcus (or rhinal fissure), separating it from the inferiolateral surface of the hemisphere close to the lamina terminalis. it is analogous to the collateral fissure found further caudally in the inferior part of the temporal lobe. rhinal sulcusbasal view of a human brain (rhinal sulcus not labeled, but is visible posterior to parahippocampal gyrus.)detailsidentifierslatinsulcus rhinalis; fissura rhinalis; sulcus rhinicus; fissura rhinicaneuronames41neurolex idbirnlex_1368ta98a14.1.09.240ta25443fma83746anatomical terms of neuroanatomy