The term area 23c refers to a part of posterior cingulate cortex located in the posterior cingulate gyrus. It is bounded caudally by area PCV, dorsally by area 5mv, area 24dd and area 24dv, and ventrally by area 31a, area 23d and area p24pr. The structures dorsal to it belong to the task positive network; those ventral to it belong to the default network. Defined in the human by multiple criteria, it shows no distinctive pattern of task-dependent fMRI activation or deactivation relative to surrounding structures ( Glasser-2016 ).