Chapter

The Swimming Circuit in the Pteropod Mollusc <i>Clione limacina</i>

Yuri I Arshavsky, Tatiana G. Deliagina and Grigori N Orlovsky

in Handbook of Brain Microcircuits

Published on behalf of Oxford University Press

Published in print August 2010 | ISBN: 9780195389883
Published online September 2012 | e-ISBN: 9780199965137 | DOI: http://dx.doi.org/10.1093/med/9780195389883.003.0050
The Swimming Circuit in the Pteropod Mollusc Clione limacina

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The marine mollusc Clione swims by rhythmically moving two wings. Each swim cycle consists of two phases—the dorsal and ventral wing flexion. Swimming is controlled by the central pattern generator located in the pedal ganglia. The rhythm generation is based on the endogenous activity of two groups of the antagonistic interneurons. These interneurons are conditional pacemakers that are transferred to a rhythm-generating state by cerebral serotonergic command neurons. The interneurons of two groups inhibit one another that determines their alternative activity. The reliable transition from one phase of the cycle to another is supported by additional mechanisms (postinhibitory rebound and a group of interneurons that promote the termination of one phase and the beginning of the other). The antagonistic interneurons control the activity of motoneurons. They excite synergetic motoneurons and inhibit antagonistic ones.

Chapter.  2030 words.  Illustrated.

Subjects: Development of the Nervous System

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