Peculiarities of topography, structure and length of sulci and gyri in left and right hemisphere frontal areas were studied in newborns. Peculiarities of cytoarchitectonics of speech areas 44 and 45 were described in left and right hemisphere of neonatal brain. Differences in the extent of neuron radial orientation and thickness of the cortex especially of layer III were defined. Great variability in square of areas 44 and 45 in left and right hemisphere of neonatal brain was established. A hypothesis on formation of structural asymmetry of the Broca center and its areas 44 and 45 by the moment of birth and heterochronia of these fields development in ontogenesis is discussed.
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