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Journal of Experimental Biology 136,53-87 (1988)
Published by Company of Biologists 1988

Control of Central Pattern Generators by an Identified Neurone in Crustacea: Activation of the Gastric Mill Motor Pattern by a Neurone Known to Modulate the Pyloric Network

PATSY S. DICKINSON ¹, FRÉDÉRIC NAGY ², and MAURICE MOULINS ²

¹ Laboratoire de Neurobiologie et Physiologie Comparées, Place du Dr Peyneau 33120 Arcachon, France and Department of Biology, Bowdoin College, Brunswick, ME 04011, USA; Department of Biology, Bowdoin College, Brunswick, ME 04011, USA
² Laboratoire de Neurobiologie et Physiologie Comparées, Place du Dr Peyneau 33120 Arcachon, France and Department of Biology, Bowdoin College, Brunswick, ME 04011, USA

In the red lobster (Palinurus vulgaris), an identified neurone, the anterior pyloric modulator neurone (APM), which has previously been shown to modulate the output of the pyloric central pattern generator, was shown to modulate the output of the gastric mill central pattern generator. APM activity induced a rhythm when the network was silent and increased rhythmic activity when the network was already active. Rhythmic activity was induced whether APM fired in single bursts, tonically or in repetitive bursts. A single burst in APM induced a rhythm which considerably outlasted the burst, whereas repetitive bursts effectively entrained the gastric oscillator.

These modulations involved two major mechanisms. (1) APM induced or enhanced plateau properties in some of the gastric mill neurones. (2) APM activated the extrinsic inputs to the network, thus increasing the excitatory synaptic drive to most of the neurones of the network. As a result, when APM was active, all the neurones of the pattern generator actively participated in the rhythmic activity. By its actions on two separate but behaviourally related neural networks, the APM neurone may be able to control an entire concert of related types of behaviour.

Key words: modulation, stomatogastric, central pattern generator, plateau potentials

Accepted on December 16, 1987

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