[Quantitative parameters of structural asymmetry of auditory cortex area 41 and 21 in the human brain]

The aim of this work was to give a quantitative characteristic of cytoarchitectonic peculiarities of cortical areas 41 and 22 in the left and right hemispheres of human brain. 20 mm thick frontal brain sections of 10 right-handed adult persons aged 29-59 stained by Nissl's crezyl-violet method were studied. The following quantitative parameters determined included area volume, cortical thickness and neuron profile area. It was shown that area 22, which is considered to be an associative link in speech stimuli processing, possessed a leftward asymmetry in cortical volume, cortical thickness and neuron profile area. Area 41, which is known to be a projection zone and to participate in sound stimuli reception, was characterized by rightward asymmetry in neuron profile area, while no dominance of particular hemisphere was found as far as cortical volume and thickness were concerned.