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Journal of Experimental Biology 147,361-374 (1989)
Published by Company of Biologists 1989

Cerebral Interneurones Controlling Feeding Motor Output In The Snail Lymnaea Stagnalis

CATHERINE R. McCROHAN ¹ and MICHAEL A. KYRIAKIDES ¹

¹ Department of Physiological Sciences, University of Manchester Manchester M13 9PT, UK

1. The cerebral ventral 1 (CV1) interneurones of Lymnaea occurred as a population of at least three in each ganglion, all with similar morphologies. Steady depolarization of a CV1 cell led to initiation and maintenance of rhythmic feeding motor output from the buccal ganglia.

2. CV1 interneurones produced facilitating excitatory postsynaptic potentials in Nl interneurones of the buccal central pattern generator for feeding. Connections with N2 interneurones were not found.

3. The CV1 population could be separated into two subgroups. CVl_a received strong synaptic feedback in phase with the buccal rhythm, leading to strong bursting during generation of feeding motor output. CVl_b received only weak feedback, and often fired continuously when depolarized.

4. Unitary inhibitory postsynaptic potentials were characteristic of all CV1 neurones, but were only visible in CVlb when it was depolarized. These inputs are thought to arise indirectly from the buccal central pattern generator.

5. The CV1 population is probably homologous with similar neurones in other gastropod species.

Key words: gastropod feeding, central pattern generator, higher-order interneurone

Accepted on July 14, 1989

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