[Prerequisites for structural asymmetry of Broca's motor speech area of the human brain].

Structural features of the Broca's speech-motor area in the left and right human cerebral hemispheres were studied. There were some peculiarities in the localization, shape, and structure of the main sulci and gyri of the frontal region in different hemispheres of the human brain. There were differences in the volume of cortical areas 44 and 45 in the left and right hemispheres, as well as in the count of neurons and in the size of pyramidal neurons in cytoarchitectonical layers III and V in the left and right hemispheres of speech-motor areas. It is suggested that left hemispherical asymmetry of Broca's area correlates with the development of human speech functions and oratory.