| Abstract: | Responses of single neurons in the vagal lobe of the medulla to stimulation of chemoreceptors in the oral cavity and gills with solutions of hydrochloric acid and sodium chloride were studied in experiments on immobilized carp. These responses were compared with those of units in the facial lobe to stimulation of cutaneous chemoreceptors. The discharge frequency in the vagal lobe was lower and the latent period longer than in the facial lobe. In two parts of the primary chemoreception center different levels of analysis of gradations of the chemical stimulus were discovered. Neurons responding both to impulses arriving from both receptive zones and selectively to stimulation either of the mouth or of the gills, were found in the vagal lobe. Activity of volley type predominated in neurons of the vagal lobe during stimulation with sodium chloride solution.A. A. Zhdanov Leningrad State University. Translated from Neirofiziologiya, Vol. 10, No. 6, pp. 613–621, November–December, 1978. |
