Solimchuk V. The morphology of the cerebellum in domestic animals

The thesis is devoted to the research of peculiarities of macro- and microscopic structure of the cerebellum in poultry (hens, ducks, geese, turkeys) and mammals (rabbits, dogs, pigs, sheep, cattle) as main representatives of the vertebrates of the phylogenetic row. It was found out that the shape, size, absolute and relative weight of the cerebellum in animals studied are different. Thus the absolute lowest weight of the cerebellum is in poultry - animals that are on the lowest rung of the historical development, and the largest one is in mammals - animals that are at a higher level of phylogenesis. It was found that the morphology of the cerebellum in experimental animals is characterized by general biological laws and defined by a certain sequence depending on the class and type of animals and shown by relevant features of morphofunctional specialization and differentiation of its histo- and cytostructures. It was found out that the representatives of the phylogenetic vertebrates, class of birds, have the smallest thickness of the cortex. It is the largest in mammals. The greatest thickness of its histoarchitectonic layers in all the animals studied is characteristic for the granular layer, it is a bit smaller in the molecular and the lowest - in the ganglionar one. It was proved and theoretically grounded that the variability of organometric weight, linear quantities of the cerebellum, its histo- and cytometric parameters in the represantatives of the class of poultry varies in a considerably narrower range than of the cerebellum in the represantatives of the class of mammals, depending on their physical activity, aliment conditions and stay of the animals on one or another step of the phylogenetic development.