retrosplenial area
The term retrosplenial area refers to a cytoarchitecturally defined portion of periarchicortex ( Stephan-1975 ). It is interposed between the presubiculum and neocortex ( Zilles-2004 ). In the primate it consists of two subareas: the retrosplenial granular area and the retrosplenial agranular area, which are located deep in the callosal sulcus in the caudal part of the posterior cingulate gyrus and isthmus of the cingulate gyrus, adjacent to the splenium of the corpus callosum. In the human it includes three of Brodmann's areas: area 26 of Brodmann (human), area 29 of Brodmann (human) ) and area 30 of Brodmann (human).
     In the monkey, Brodmann-1909 identified an area 26 of Brodmann (guenon) as equivalent to the sum of the three human areas. Subsequent investigators have abandoned the designation 26 for the macaque, dividing the area into a retrosplenial granular area ( area 29 (macaque) and a retrosplenial agranular area ( area 30 (macaque) ) ( Vogt-1987 ).
     In the rat ( Swanson-2004; Paxinos-2009b ) and mouse ( Hof-2000; Franklin-2008 ) the retrosplenial area is divided into a retrosplenial granular area, a retrosplenial dysgranular area, and, by some authors ( Swanson-2004; Dong-2004 ), a retrosplenial agranular area.

Also known as: retrosplenial cortex, retrosplenial regionNeuroNames ID : 2436

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