The term area 24b' refers to a part of the posterior midcingulate cortex, which is located caudal to the anterior midcingulate cortex in the anterior cingulate gyrus of the human and the macaque. Located in the center of the gyrus, it is bounded by area 24a' ventrally and by area p24c' and area 24d dorsally. Defined on the basis of internal structure it is subdivided into two parts, area a24b' and area p24b'. In the macaque it is subdivided similarly. It exists in the rat and the mouse as well but is not subdivided ( Vogt-2016 ).