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refers to a set of convolutions on the ventral surface of the frontal lobe in primates. It is defined on the basis of topology ( Nomina-1983 ). In the human it consists of the medial orbital gyrus, the intermediate orbital gyrus, the lateral orbital gyrus, the frontomarginal gyrus, and the posterior orbital gyrus ( Mai-1997 ).
In the macaque it consists of the medial orbital gyrus, lateral orbital gyrus and even more lateral fronto-orbital gyrus ( Krieg-1975 ). For segmentation of this region on the basis of internal architecture see orbitomedial prefrontal cortex.
For comparable areas in the rat and mouse, see orbital areas (rodent).
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