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). The rhinal sulcus separates the parahippocampal uncus from the rest of the temporal lobe in the neocortex.^[1] The rhinal sulcus and the hippocampal sulcus were both present in early mammals.^[1]

Rhinal sulcus
Basal view of diagram of human brain (rhinal sulcus not labeled, but is visible posterior to parahippocampal gyrus.)
Details
Identifiers
Latin	sulcus rhinalis; fissura rhinalis; sulcus rhinicus; fissura rhinica
NeuroNames	41
NeuroLex ID	birnlex_1368
TA98	A14.1.09.240
TA2	5443
FMA	83746
Anatomical terms of neuroanatomy [edit on Wikidata]

It is analogous to the collateral fissure found further caudally in the inferior part of the temporal lobe.