Fig. 1.

(A) Lateral view of intact, adult female chimpanzee brain. (B) Complete dissection map, illustrating the 742 pieces of tissue dissected from the chimpanzee cortex. Total cell density in millions of cells per square centimeter of cortical surface is illustrated on the cortex flat map, with the darkest shading indicated areas of high cell density and lighter shading indicating low cell density. The total cell density includes all types of cells in cortex; that is, neurons, glial cells, and epithelial cells. Areal boundaries are estimated for V1, V2, somatosensory (areas 3b, 3a, 1, and 2), motor (areas 4 and 6), and premotor cortex. (C) Complete dissection map illustrating the 742 pieces of tissue dissected from the chimpanzee cortex. Total neuron density in millions of cells per square centimeter of cortical surface is illustrated on the cortex flat map, with the darkest shading indicating areas of high neuron density and lighter shading indicating low neuron density.