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J Neurophysiol 83: 3201-3208, 2000;
0022-3077/00 $5.00
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The Journal of Neurophysiology Vol. 83 No. 6 June 2000, pp. 3201-3208
Copyright ©2000 by the American Physiological Society

Cooperation of Muscle and Cutaneous Afferents in the Feedback of Contraction to Peroneal Motoneurons

Jean-François Perrier, Boris Lamotte D'Incamps, Nezha Kouchtir-Devanne, Léna Jami, and Daniel Zytnicki

Centre National de la Recherche Scientifique EP 1848, Université René Descartes, Unité de Formation et de Recherche Biomédicale, 75270 Paris 06, France

Perrier, Jean-François, Boris Lamotte D'Incamps, Nezha Kouchtir-Devanne, Léna Jami, and Daniel Zytnicki. Cooperation of Muscle and Cutaneous Afferents in the Feedback of Contraction to Peroneal Motoneurons. J. Neurophysiol. 83: 3201-3208, 2000. Peroneal motoneurons were recorded intracellularly in anesthetized cats during sustained submaximal contractions of peroneus brevis muscle (PB) elicited by repetitive electrical stimulation of motor axons in the distal portion of cut ventral root filaments. Mechanical stimulation of the territory innervated by the superficial peroneal nerve (SP) was applied during contraction to assess the influence of afferents from this territory on the contraction-induced excitation of motoneurons. In 21 peroneal motoneurons in which PB contraction evoked excitatory potentials, a stimulation engaging mechanoreceptors located in the skin around toes was found to either enhance (in 12 motoneurons) or reduce (in 9 motoneurons) the contraction-induced excitatory potentials. Among positive effects, six showed simple summation of the responses to each individual stimulus, suggesting a convergence of afferent pathways on motoneurons. In six other motoneurons, complex interactions were observed, as may result from convergence at a premotoneuronal level. Among negative effects, a single instance was observed of inhibitory facilitation, as may result from convergence of cutaneous and muscular, possibly Ib, afferents on inhibitory interneurons. Several pathways, mediating either facilitory or inhibitory influences, are available for cooperation of muscle and cutaneous input, allowing flexibility of motoneuron activation in different tasks.




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Positive Proprioceptive Feedback Elicited By Isometric Contractions of Ankle Flexors on Pretibial Motoneurons in Cats
J Neurophysiol, November 1, 2002; 88(5): 2207 - 2214.
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 J. Neurophysiol.Home page
J.-F. Perrier, B. L. D'Incamps, N. Kouchtir-Devanne, L. Jami, and D. Zytnicki
Effects on Peroneal Motoneurons of Cutaneous Afferents Activated by Mechanical or Electrical Stimulations
J Neurophysiol, June 1, 2000; 83(6): 3209 - 3216.
[Abstract] [Full Text] [PDF]


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