[Quantitative characteristics of the systems of truncal auditory and visual brain formations in Artiodactyla and...

On the ground of cytoarchitectonic investigation and planimetric measurements a volumetric comparison between the systems of truncal formations of auditory and optical analysers were made in the representatives of artiodactyla (deer, elk, gazelle, sheep, wild boar, hippopotamus) and perissodactyla orders (horse). The data obtained demonstrated a great quantitative predominance of the system of optical formation in comparison with that of auditory, which correlates to the leading role of the optical system in these animals. In non-ruminants, according to other environmental conditions, vision looses its biological importance, such as in ruminants. In the former, therefore, a much less predominance of the optical formations comparing with the auditory ones was revealed. Comparisons with the previous results of the author obtained in other mammal orders, demonstrated quantative changebility--plasticity of corresponding truncal auditory, optical and vesitbular formations in response to ecologically stipulated changes of leading afferentation in different mammals.