The term perisplenial region refers to the combination of two architectonically defined areas of the posterior cingulate gyrus in the human and the macaque, namely, posterior cingulate cortex and retrosplenial cortex. 'Retrosplenial region' was originally defined by Brodmann-1909 as the combination of area 29 and area 30, i.e., retrosplenial cortex. But in recent decades it has come to be used in clinical and imaging literatures to represent the combination of retrosplenial cortex and posterior cingulate cortex. 'Perisplenial region' was recommended in Vogt-2012 as a substitute for 'retrosplenial region' to avoid ambiguity in use of the term.