rhinal sulcus
Acronym: rhs
The term rhinal sulcus refers, in the primate, to a groove on the ventromedial surface of the temporal lobe that separates the entorhinal area of the parahippocampal gyrus from more lateral structures. In the human it separates the entorhinal area of the parahippocampal gyrus from the fusiform gyrus ( Carpenter-1983 ). Some authors regard it to be an extension of the collateral sulcus in the human ( Mai-2004 ). In the macaque it separates the entorhinal area from the inferior temporal gyrus ( Martin-2000 ).
     One of only four 'grooves' in the cerebral cortex of the rat ( Swanson-2004 ), it runs longitudinally on the ventrolateral surface, almost the entire length of the cortex. Caudally it separates the entorhinal area ventrally from the ectorhinal area dorsally. More rostrally, the perirhinal area intervenes between those two areas, and the rhinal sulcus runs within it. At about the anterior-posterior level of the hypothalamus, the ectorhinal area disappears and the sulcus separates the entorhinal area and the perirhinal area ventrally from the agranular insula dorsally. Rostrally from there, it runs within the agranular insular area and most rostrally it separates the piriform cortex ventrally from the agranular insular area dorsally ( Swanson-2004 ). A similar but less prominent, interrupted sulcus is found in the mouse ( Hof-2000 ).

Also known as: rhinal fissure, Sulcus rhinalisNeuroNames ID : 41

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