Cooperative mechanisms between leg joints of Carausius morosus I. Nonspiking interneurons that contribute to interjoint coordination

Journal of Neurophysiology
D E Brunn

Abstract

Three nonspiking interneurons are described in this paper that influence the activity of the motor neurons of three muscles of the proximal leg joints of the stick insect. Interneurons were recorded and stained intracellularly by glass microelectrodes; motor neurons were recorded extracellularly with oil-hook electrodes. The motor neurons innervate the two subcoxal muscles, the protractor and retractor coxae, and the thoracic part of the depressor trochanteris muscle. The latter spans the subcoxal joint before inserting the trochanter, thus coupling the two proximal joints mechanically. The three interneurons are briefly described here. First, interneuron NS 1 was known to become more excited during the swing phase of the rear and the stance phase of the middle leg. When depolarized it excited several motor neurons of the retractor coxae. This investigation revealed that it inhibits the activity of protractor and thoracic depressor motor neurons when depolarized as well. In a pilocarpine-activated animal, the membrane potential showed oscillations in phase with the activity of protractor motor neurons, suggesting that NS 1 might contribute to the transition from swing to stance movement. Second, interneuron NS 2 inhibits motor ...Continue Reading

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Citations

Dec 4, 2003·Annual Review of Entomology·Fred Delcomyn
Jun 10, 2017·Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology·Elzbieta Godlewska-HammelMatthias Gruhn
Mar 29, 2003·Neural Networks : the Official Journal of the International Neural Network Society·Holk CruseJosef Schmitz

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