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Rapid cortical surface area growth and gyrification after the completion of excitatory neurogenesis. (A and B) Coronal sections of macaque frontal cerebrum at E90 and E138 stained for Nissl. Abbreviations: CTX, cerebral cortex; IZ, intermediate zone; WM, white matter; CGS, cingulate sulcus; SAR, superior arcuate sulcus; STR, striatum; PS, principal sulcus; IAR, inferior arcuate sulcus; LORB, lateral orbital sulcus; OLFS, olfactory sulcus. (Scale bar, 2 mm.)
