Abstract
Previous studies have shown that one version of the coordination of the central buccal generator in the mollusk Lymnaea stagnalis with the rhythm of neuron B2, which controls esophageal motility, is associated with the occurrence of giant hyperpolarization waves on B2 neurons. The present report describes new neurons which appear to be the source of these waves on neuron B2. Stimulation of these cells induces deep and long-lasting direct non-synaptic inhibition of neuron B2. In addition, these neurons could increase the frequency of the buccal rhythm and depolarize motoneuron B4, which plays a role in the buccal rhythm; nitric oxide increased their effects. These results provide evidence that identified neurons may coordinate motor feeding rhythms via a volume transmission mechanism.
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