[Gender-related peculiarities of cytoarchitecture of speech-motor fields 44 and 45]

Cytoarchitecture of brain speech-motor fields 44 and 45 was studied in 5 adult men and 5 women. The width of the cortex and its layers, the profile field area of layer III and V neurons, the numerical density of layer III neurons in area 45, and the numerical density of satellite gliocytes and neurons surrounded by them, were measured in 20 microm thick total frontal sections, stained with cresyl violet. Both in men and women, the tendency for the left hemisphere dominance was detected for the values of the number of the cytoarchitectural indices, including the width of the associative layer III, the value of the profile field area of the neurons of this layer, the increased frequency of large and super large neurons. Interhemispheric differences of these indices were more expressed in men as compared to women. Several signs of sexual dimorphism were found between men and women. The most significant of these were the increase of neuronal numerical density and of the density of satellite gliocytes and neurons surrounded by them, found in women.