Brodmann area 30, also known as agranular retrolimbic area 30, is a subdivision of the cytoarchitecturally defined retrosplenial region of the cerebral cortex. Cytoarchitecture is the cellular composition of a bodily structure The retrosplenial region is a brain area and part of the Cingulate cortex. The cerebral cortex is a structure within the Brain that plays a key role in Memory, Attention, perceptual Awareness, Thought, In the human it is located in the isthmus of cingulate gyrus. Cytoarchitecturally it is bounded internally by the granular retrolimbic area 29, dorsally by the ventral posterior cingulate area 23 and ventrolaterally by the ectorhinal area 36 (Brodmann-1909). Brodmann area 29, also known as granular retrolimbic area 29, is a cytoarchitecturally defined portion of the Retrosplenial region of the Cerebral Brodmann area 23 (BA23 is a region in the Brain corresponding to some portion of the Posterior cingulate cortex. Ectorhinal area 36 is a subdivision of the cytoarchitecturally defined Temporal region of Cerebral cortex.