retrosplenial granular area
The term retrosplenial granular area refers to one of two or three divisions of the retrosplenial area of cerebral cortex. It is defined by Nissl stain and located adjacent to the splenium of the corpus callosum. Cytoarchitecturally it is distinguished from the other divisions, the retrosplenial agranular area and the retrosplenial dysgranular area, by its distinctly organized granular layer. In primates it occupies a narrow strip of the isthmus of the cingulate gyrus deep in the callosal sulcus. It is identified with area 26 of Brodmann (human) and area 29 of Brodmann (human) ( Zilles-2004 ) and with area 29 (macaque) ( Vogt-1987 ).
     In rodents it is located on the mesial surface of the cortex of the cerebral hemisphere, dorsal and caudal to the splenium of the corpus callosum. In the rat it consists of two or three parts: zone a of the retrosplenial granular area, zone b of the retrosplenial granular area and zone c of the retrosplenial granular area ( Paxinos-2009b ). Some authors regard zone b and zone c as one: zone b-c of the retrosplenial granular area ( Swanson-2004 ). In the mouse it may be subdivided ( Franklin-2008 ) or not ( Hof-2000 ).

Also known as: retrosplenial granular cortexNeuroNames ID : 1802

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