Rhytmic activity of neurones identified in the central nervous system of Helix pomatia and its changes caused by Dazomet and Dipterex

Bay, Truong Van and Kiss, István (1976) Rhytmic activity of neurones identified in the central nervous system of Helix pomatia and its changes caused by Dazomet and Dipterex. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 43. pp. 3-19. ISSN 0365-3005

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Abstract

In the visceral ganglion of the central nervous system of Helix pomatia the spontaneous activity of 14 neurones was examined as well as the chemical sensitivity of these neurones to Dazomet and Dipterex used in the plant protection was tested. The chemicals were applied in perfusion. On the basis of the spontaneous activity pacemaker, synaptically influenced and driven cells can be distinguished. The differences among the interspike interval histograms of these neurones were analyzed. In addition the magnitude of the membrane potential, the amplitude of the action potentials, the firing rate and the temporal changes of all the above parameters were studied during long lasting recording. The results do not differ considerably from the data obtained on other Gastropod species. The activity pattern of the neurones under complicated synaptic control shows a plasticity of high degree, which refers to an important role of these neurones played in the ganglionic integration. Similarly to the transmitter substances Dazomet and Dipterex caused an excitation on some of the cells and an inhibition on the others, while in a part of the neurones they were ineffective. The effect of the substances under study can be regarded as a specific one modifying the permeability of the somatic membrane.

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