[Formation of neuronal reactions of the limbic cortex to visceral stimuli in the early ontogeny of the rabbit].

Studies have been made on age peculiarities of the evoked activity in neurones of the limbic cortex in response to visceral stimulation in rabbits from 4 age groups (1-8, 10-20, 23-35, 40-75 days). It was shown that from the earliest postnatal stages neurones of the limbic cortex exhibit high reactivity to sensory stimuli. In new-born rabbits, 86.8 and 70.1% of the neurones of the anterior and posterior limbic cortex respectively react to electrical stimulation of the vagal nerve. On further development of animals the number of reacting neurons increases, reaching 100% in 1.5-2 months old rabbits. Within all age periods, the predominant responses are presented by phasic activational and specific ones, the latter being of "on", "on-off" and complex patterns. Together with the development and changes of neuronal responses, evident dynamics of latent periods was noted, the average value of them decreasing 1.5-3 times for all types of neuronal reactions. The results obtained indicate early maturation of the neuronal mechanisms in the limbic cortex, which are involved into analysis of signals from the internal milieu of the organisms.