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Journal of Experimental Biology, Vol 201, Issue 24 3333-3338, Copyright © 1998 by Company of Biologists

JOURNAL ARTICLES

Locust dorsal unpaired median (DUM) neurones directly innervate and modulate hindleg proprioceptors

P BrAUnig and M Eder
Institut fur Zoologie der Technischen Universitat Munchen, Lichtenbergstrasse 4, Germany. braeunig@bio2.rwth-aachen.de.

A subgroup of the large efferent octopaminergic dorsal unpaired median (DUM) neurones of the third thoracic ganglion, the DUM3,4,5 neurones, directly innervates the tendons of certain proprioceptors of the locust hindleg, the so-called strand receptors. The terminals of the DUM neurones occur in regions of the strands that also contain the dendrites of the mechanoreceptive sensory cells. Both stimulation of the DUM3,4,5 neurones and bath application of octopamine change the responses of strand receptor units to mechanical stimulation. In both situations, most single strand receptor units show an increased response to mechanical stimulation. Some units, however, decrease their sensitivity to mechanical stimulation in response to octopamine application or DUM neurone stimulation.


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© The Company of Biologists Ltd 1998