[Correlation between ipsi- and contralaterally directed nerve fibers from zone CI in the cerebral cortex of the rat].

On frontal sections of the brain of albino rats, by means of peroxidase technique, studies have been made on peculiarities of distribution of cortical nervous fibers from somatosensory zone CI in fugal and comissural directions. Horseradish peroxidase was administered electrophoretically in the focus of the primary response to electrical stimulation of the distal part of the forelimb of the animal. The data obtained were compared with the results of the distribution of labeled fibers from other, more lateral CI zones. Single retrogradely labeled cells in symmetrical (with respect to peroxidase application zones) CI areas of contralateral hemisphere were found, indicating the existence of single comissural connections between these parts of the brain cortex. It was established that among anterogradely labeled fibers emerging from the label zone in focus of the primary response, comissural ones constitute 26-28%, whereas among fibers from the same zone outside primary response focus their share increases up to 53-68%.