The morphology of the precentral gyrus is of particular interest because it is the origin of the pyramidal pathway responsible for voluntary movements. The aim of the study was to determine the width of the precentral gyrus, the thickness of the cerebral cortex in it and X-ray density of neurons in young boys and girls according to X-ray computed tomographic examination. Material and methods. 35 male and 37 female with mesocephalic sculls aged 18 to 20 years old with predominance of the right

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... nd and no pathology of the nervous system organs in the anamnesis were examined. Results. The maximal value of the precentral gyrus width was found at the point located above the superior temporal gyrus. Values were lower (p < 0.01) at the point located at the level of the middle frontal gyrus. The smallest precentral gyrus width was found at a point above the cingulate gyrus (p < 0.01). When comparing the indices in each point, there is a tendency for them to be slightly more prevalent in the left hemisphere than in the right. There is a tendency to non-significant prevalence in boys compared to girls (p > 0.05). Parameters of cortical thickness in the precentral gyrus in the studied points did not differ statistically significantly, but there was a tendency to their insignificant predominance in the left hemisphere compared to the right, as well as in boys compared to girls (p > 0.05). Values of the X-ray neuron density in the compared points of the precentral gyrus in both hemispheres did not differ statistically significantly for boys and girls. Conclusions. The established results will serve as the initial data as a criterion of age-specific morphological norm in young mesocephals with predominance of the right hand, which is highly demanded in the personalized approach in medical practice. These results can also be used in prospective clinical and basic research.