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Journal of Experimental Biology 82,281-288 (1979)
Published by Company of Biologists 1979

Intrasegmental Proprioceptive Influences on the Period of the Swimmeret Rhythm in Crayfish

LANI WEST ¹, GWEN JACOBS ², and BRIAN MULLONEY ²

¹ Zoology Department, University of California, Davis, California 95616; Biological Sciences, Hopkins Marine Station of Stanford University, Pacific Grove, California
² Zoology Department, University of California, Davis, California 95616

To whom requests for reprints should be addressed.

When the swimmerets of decapods beat, they do so because the muscles of each swimmeret are driven by a series of periodic bursts of impulses in its motor neurones. We investigated the effects of proprioceptive feedback on the period of this motor pattern by interfering with the movement of particular swimmerets. In different experiments, we observed three different kinds of results during interference with a swimmeret. Either the period decreased, or it did not change, or bursting was inhibited altogether. These different results are discussed in terms of the connectivity of different command fibres.

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