and area 13b occupies a region just anterior to 13a along the olfactory sulcus. Area 13m is on the medial part of the middle orbital gyrus, whereas 13l is in the lateral part of the gyrus.

Subregions

Areas 13m and 13l are dysgranular regions of cortex. These areas are differentiated from the more anterior area 11 by a lack of continuous granular layer, and from the more posterior agranular Insular cortex.

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