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Journal of Experimental Biology 54,215-233 (1971)
Published by Company of Biologists 1971

Innervation of Coxal Depressor Muscles in the Cockroach, Periplaneta Americana

K. G. PEARSON ¹ and J. F. ILES ²

¹ Department of Physiology, University of Alberta, Edmonton, Canada
² University Department of Physiology, Oxford, England

1. The innervation of the mesothoracic and metathoracic coxal depressor muscles has been investigated using intracellur microeletrodes.

2. Five motor axons have been found to innervate the coxal depressor muscles; the largest is fast axon, the second largest a slow axon and the three smallest are all inhibitory axons.

3. The fast axon innervates the anterior and posterior coxal depressor muscles as well as parts of the coxal branches of the main leg depressor muscle. The slow innervates all fibres in the coxal branches of the main leg depressor muscle. The three inhibitory axons innervate only those parts of the coxal branches of the main leg depressor muscle which are not innervated by the fast axon.

4. The three inhibitory axons were found to be branches of three different common inhibitory motoneurones.

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