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Journal of Experimental Biology 90,197-203 (1981)
Published by Company of Biologists 1981

Reversal of a Walking Leg Reflex Elicited by a Muscle Receptor

R. A. DiCAPRIO ¹ and F. CLARAC ²

¹ Department of Physiology, University of Bristol, BS1 5LS and Laboratoire de Neurobiologie Comparee, 33120 Arcachon, France; Department of Biological Sciences, S.U.N.Y. at Buffalo, Buffalo, N.Y. 14260 U.S.A.
² Department of Physiology, University of Bristol, BS1 5LS and Laboratoire de Neurobiologie Comparee, 33120 Arcachon, France

Passive movement of the basal (thoracic-coxal) leg joint in the shore crab Carcinus maenas normally elicits a resistance reflex in the promotor and remotor motoneurones. Remotion of the joint excites promotor moto-neurones and promotion excites remotor motoneurones. This reflex behaviour may reverse and become an assistance reflex, where movement of the joint excites the motoneurones innervating the muscle which would assist the passive movement. This reversal of reflex activity appears to be dependent upon the central state of activity of the animal.

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