Responses of central neurones to the stimulation of heart chemoreceptors in the snail, Helix pomatia L.

S.-Rózsa, Katalin and Salánki, János (1973) Responses of central neurones to the stimulation of heart chemoreceptors in the snail, Helix pomatia L. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 40. pp. 95-108. ISSN 0365-3005

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Abstract

The responses of central neurones to chemical stimulation of the heart were examined in the visceral and right parietal ganglia of the snail Helix pomatia L. These responses were compared with reactions evoked by stimulation of the mechanoreceptors of the heart. The following results were obtained: Twelve neurones were identified in the visceral and parietal ganglia responding to the stimulation of the heart with 5HT. The response was either an increase or a decrease in activity. Four neurones, three from the visceral (V12, V13 and V17) and one from the right parietal ganglion (RPa9) gave biphasic reaction at chemical stimulation of the heart: the initial excitatory phase was followed by the inhibition of spike generation. In case of long lasting stimulation the alteration of the two phases was observed. Cells V12 and V13 belong definitely to central neurones of the heart reflex. At stimulation of the chemoreceptors a close correlation was found between the spikes of these neurones and a particular component of the heart nerve activity. These neurones can be considered as central neurones of the extracardial heart regulation. Most of the neurones investigated responded both to the chemical and tactile stimulation of the heart, however, in some cases the reaction was different to different modes of stimulation. Neurones, responding only to one type of stimulus can be considered as primary sensory neurones.

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