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First published online May 1, 2006
Journal of Experimental Biology 209, 1827-1836 (2006)
Published by The Company of Biologists 2006
doi: 10.1242/jeb.02212
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Common and specific inhibitory motor neurons innervate the intersegmental muscles in the locust thorax

Peter Bräunig1, Michael Schmäh2 and Harald Wolf2,*

1 Institut für Biologie II, Rheinisch-Westfälische Technische Hochschule Aachen, Kopernikusstraße 16, D-52074 Aachen, Germany
2 Abteilung Neurobiologie, Universität Ulm, Albert-Einstein-Allee 11, D-89081 Ulm, Germany

* Author for correspondence (e-mail: harald.wolf{at}uni-ulm.de)

Accepted 16 March 2006

The inhibitory innervation of the intersegmental (body wall) muscles between the first and the second thoracic segment of the migratory locust, Locusta migratoria, was investigated using neuroanatomical, immunocytochemical and electrophysiological techniques. Three neurons located in the prothoracic ganglion show GABA-like immunoreactivity and project into the intersegmental nerve. Two are common inhibitors. One of those innervates the oblique intersegmental muscle M59 and two dorsal longitudinal muscles (M81 and M82). The second common inhibitor also innervates M59 and the ventral longitudinal muscle M60. The third neuron innervates M60 exclusively and, for that reason, has to be regarded as the first specific inhibitor ever observed in insect neuromuscular assemblies. According to their innervation pattern, we term these neurons CI59/60, CI59/81/82, and SI60. CI59/81/82 and CI59/60 appear to be segmentally homologous to CIa and CIb neurons, respectively, in the other body segments.

Key words: insect, inhibitory motor neuron, neuroanatomy, electrophysiology, locust, Locusta migratoria


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