[Quantitative characteristics of the vestibular nuclei of the brain in the dolphin and man].

Selective qualitative and quantitative distinctions, most markedly expressed in dolphins as compared with man, were found in the lateral vestibular nucleus of the brain. In man it is the least nucleus (according to the territory) in the whole vestibular complex, while in dolphins it is the largest nucleus (9-16 times as great as in man), which has the largest area but the least density of cells. The above selectivity of changes in the structural organization of the lateral vestibular nucleus is considered as a result of ecological and physiological differences in the organization and coordination of the volume of motor acts and muscle tone when changing the position of the body in space.