Dorsal parts of PCC (#1) at area 23c, #2 at area 31 and #3 at medial parietal area 7m. Area 23c has a disproportionately broad superficial layer and compressed layer V. Area 31 has the thickest layer IV of any cingulate area and high densities of layer IIIc NFP-expressing neurons. Area 7m has a much broader layer IV than area 31, very large and dense, NFP-expressing, layer IIIc pyramids, and small neurons that extend into layer IIIc. The stacking of neurons in mid-cortical layers is characteristic of area 7m (asterisks; magnification two times) and not of area 31. Scale bar, 250 μm.