Mammalian cerebral cortices.

(A) Mouse, (B) cat, (C) macaque monkey, and (D) marmoset monkey cortex. Cortical areas are shown with their respective cytoarchitectonic status dictated by cortical types (mouse and cat) or neuronal density per mm3 (marmoset and macaque monkey). Cortical types define an ordinal scale from cytoarchitectonically less differentiated areas, which correspond to overall less neuronally dense areas (lower cortical types), to cytoarchitectonically more differentiated areas, which correspond to overall more neuronally dense areas (higher cortical types). Note that there is no one-to-one correspondence of the cortical types for the mouse and cat cortex. Each scale denotes degrees of cytoarchitectonic differentiation within each species. (E) Illustration of cortex size differences and phylogenetic relations of the examined species. See S1 Table for full names of the cortical areas. max, maximum; min, minimum.