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Possibility of interaction between synaptic and pacemaker mechanisms of the electrical activity in the bursting neuron of the edible snail helix pomatia


, : Possibility of interaction between synaptic and pacemaker mechanisms of the electrical activity in the bursting neuron of the edible snail helix pomatia. Neirofiziologiya 13(1): 67-74

Membrane hyperpolarization in neuron RPa1 of H. pomatia was induced by short-duration pulses of inward current, spontaneous IPSP [inhibitory postsynaptic potential] arising in the neuron, and stimulation of the anal nerve evoking IPSP in the neuron. Short-duration hyperpolarization of the membrane was demonstrated to trigger a regenerative hyperpolarization lasting up to several seconds. The time course of IPSP arising in the neuron spontaneously or after stimulation of the anal nerve was similar to that of the regenerative hyperpolarization triggered by the inward current pulse. Regenerative hyperpolarization linked with involvement of endogenous mechanisms may be triggered not only by short-duration hyperpolarization of the neuronal membrane but also by hyperpolarization occurring during IPSP generation.

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