[Development of the entorhinal region of the cerebral cortex during rhesus macaque ontogeny]

The entorhinal area of the monkey brain cortex was studied in cerebral serial frontal sections of Macaca rhesus at 8 different prenatal and postnatal periods. The sections were stained with cresyl violet. Quantitative methods were applied. The main periods for anlage, stratification and differentiation of the brain cortex entorhinal area of Macaca rhesus were revealed. A special attention was paid to cell differentiation in separate layers of the entorhinal area in its subareas and fields. The main cytoarchitectonic development of the monkey cerebral entorhinal area was demonstrated to take place during prenatal ontogenesis, its cortical area, its total thickness and that of its separate layers, as well as cell size are, on the whole, formed and approach, according to their quantitative indices, the definitive state.