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Journal of Experimental Biology 105,253-273 (1983)
Published by Company of Biologists 1983

Motor Control of Movements of the Antennal Flagellum in the Australian Crayfish, Euastacus Armatus

DAVID C. SANDEMAN ¹ and LON A. WILKENS ²

¹ Department of Neurobiology, Australian National University, Canberra, Australia; School of Zoology, University of New South Wales, P.O. Box 1, Kensington, N.S. Wales 2033, Australia
² Department of Neurobiology, Australian National University, Canberra, Australia; Department of Biology, College of Arts and Sciences, University of Missouri, St. Louis, 8001 Natural Bridge Road, St. Louis, Missouri 63121, U.S.A.

1. Voluntary and reflexive antennal movements of an Australian fresh-water crayfish are described.

2. An anatomical and physiological study showed that the flagellar flexor muscle is innervated by three motor neurones (a common inhibitor and two exciters) and the flagellar extensor muscle receives four motor neurones (a common inhibitor and three exciters).

3. The discharges of three of the motor neurones to the flexor and extensor muscles (tonic flexor, tonic extensor, common inhibitor) were recorded simultaneously with the movements of the flagellum in intact but restrained animals. Phase relationships between flexors and extensors are not simply antagonistic for all voluntary movements. The common inhibitor is more often in phase with, or leads, tonic extensor activity, than tonic flexor activity.

Key words: Crayfish, antenna, motor control

Submitted on September 7, 1982
Accepted on January 11, 1983

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