The term area 23d of Vogt refers to one of four parts of the dorsal posterior cingulate cortex in the human and the macaque. The other parts are area 23c of Vogt, area d23, and area d31. It is located in the cingulate gyrus caudal to the posterior midcingulate cortex, rostral to area d23, and ventral to area 23c of Vogt. It is separated from the corpus callosum by the retrosplenial area, which occupies the upper bank of the callosal sulcus. It is defined on the basis of internal structure ( Vogt-2012 ). It may have partial equivalence to the cingulate/retrosplenial cortex of the rat ( Swanson-2004 ) and the mouse ( Hof-2000 ).