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J Neurophysiol 80: 2776-2780, 1998;
0022-3077/98 $5.00
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The Journal of Neurophysiology Vol. 80 No. 5 November 1998, pp. 2776-2780
Copyright ©1998 The American Physiological Society

RAPID COMMUNICATION


Activation of a Lobster Motor Rhythm-Generating Network by Disinhibition of Permissive Modulatory Inputs

Serge Faumont, John Simmers, and Pierre Meyrand

Laboratoire de Neurobiologie des Réseaux, Université Bordeaux I et Centre National de la Recherche Scientifique Unité Mixte de Recherche 5816, F-33120 Arcachon, France

Faumont, Serge, John Simmers, and Pierre Meyrand. Activation of a lobster motor rhythm-generating network by disinhibition of permissive modulatory inputs. J. Neurophysiol. 80: 2776-2780, 1998. Rhythm generation by the gastric motor network in the stomatogastric ganglion (STG) of the lobster Homarus gammarus is controlled by modulatory projection neurons from rostral commissural ganglia (CoGs); blocking action potential conduction in these inputs to the STG of a stomatogastric nervous system in vitro rapidly renders the gastric network silent. However, exposure of the CoGs to low Ca2+ saline to block chemical synapses activates a spontaneously silent gastric network or enhances an ongoing gastric rhythm. A similar permissive effect was observed when picrotoxin was also superfused on these ganglia. We conclude that in the CoGs continuous synaptic inhibition is exerted on modulatory projection neuron(s) and that release from this inhibition allows strong activation of the gastric network.




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