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Journal of Experimental Biology 136,103-123 (1988)
Published by Company of Biologists 1988

Central Coordination of Buccal and Pedal Neuronal Activity in the Pond Snail Lymnaea Stagnalis

M. A. KYRIAKIDES ¹ and C. R. MCCROHAN ¹

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

Cyclical synaptic inputs were recorded from identified giant neurones and neuronal cluster cells in the pedal ganglia of Lymnaea stagnalis. They occurred in phase with rhythmical inputs to buccal ganglion motoneurones, which have been shown to originate from interneurones of the buccal central pattern generator for feeding. In pedal neurones, the cyclical inputs were mainly inhibitory, and occurred predominantly during the radula retraction phase of the feeding cycle.

Tonic depolarization of higher-order interneurones in the feeding system, to activate the buccal central pattern generator, led to the onset of cyclical inputs to pedal neurones. These inputs were abolished after cutting the cerebrobuccal connectives, supporting the hypothesis that they originate from the buccal ganglia. The possible role of these inputs in coordinating foot and body wall movements with the buccal feeding rhythm is discussed.

Key words: Lymnaea stagnalis, molluscan CNS, neural coordination, feeding, locomotion, motor programme

Accepted on November 23, 1987

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