[Structural basis of sensomotor integration in the cerebral cortex of cats]

The connection of the dimple zone of the somatic sensory cortex with a lateral area of gyrus cruciatus in the motor cortex was investigated by means of the Nauta-Gygax, Fink-Heimer techniques and retrograde axonal transport of horseradish peroxidase. A height degree of differentiation is detected in organization of transcortical sensomotor projections. The pyramidal, stellate and inverted pyramidal cells of the third layer of he cortex participate in formation of these ways. Th data obtained by the experimental degeneration method and electron microscopic technique show that hte afferentation from the first somatic sensory area terminates mainly on dendritic spines in layers III and V and partly on elements in layer I in the motor cortex. It is suggested that the associative fibres exert their action on the projectional neurons of the motor area directly or through inter-neurons.