rhinal sulcus

{{Short description|Groove in the brain's temporal lobe}}

{{Infobox brain

| Name = Rhinal sulcus

| Latin = sulcus rhinalis; fissura rhinalis; sulcus rhinicus; fissura rhinica

| Image = Gehirn, basal - beschriftet lat.svg

| Caption = Basal view of diagram of human brain (rhinal sulcus not labeled, but is visible posterior to parahippocampal gyrus.)

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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.{{cite journal |last1=Ribas |first1=Guilherme Carvalhal |title=The cerebral sulci and gyri |journal=Neurosurgical Focus |date=February 2010 |volume=28 |issue=2 |doi=10.3171/2009.11.FOCUS09245 }} The rhinal sulcus and the hippocampal sulcus were both present in early mammals.

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