Inter-and intraganglionar synaptic connections formed by neurons of the <Emphasis Type="Italic">Helix</Emphasis> visceral ganglion

In experiments on the subpharyngeal complex of the Helix ganglia, we found an excitatory monosynaptic input to the pacemaker PPa2 neuron from an unidentified cell of the visceral ganglion and a polysynaptic inhibitory influence of another unidentified neuron of this ganglion on the PPa1 cell. In addition, we revealed three pairs of neurons synaptically connected with each other (excitatory connections) in the visceral ganglion. In the case where we used high-frequency (11 sec⁻¹) stimulation of presynaptic elements, synaptic transmission to the PPa2 neuron demonstrated the greatest efficiency and stability. Neirofiziologiya/Neurophysiology, Vol. 39, No. 1, pp. 32–36, January–February, 2007.