[Distribution of the intrahemispheric and interhemispheric afferent connections of the visual and parietal regions of the cat cerebral cortex].

Distributional peculiarities of the associative and callosal connections of the visual area and parietal region in the cat cortex have been studied by Nauta-Guigax and Fink-Heimer's methods. Their horizontal and transversal distribution in the parietal and occipital areas are described. The afferents of the visual projection area are rare in both hemispheres, but spread in all visual areas and middle suprasilvian girus. The connections of the parietal associative area are expressed better and seen in all areas of parietal and occipital regions of the ipsilateral hemisphere, in the contralateral hemisphere, however, they are found in its homotopic area. Both afferent, independently of their origin are characterized by the identical distribution along the transverse of the different zones of the neocortex. For example, in field 17 the oblique and radially oriented degenerating fibres are represented equally and are limited by inner layers, as to the parietal associative region, predominatingly radial parallel fibres are seen along the whole cortex, they terminate mainly in the upper layers.