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Journal of Experimental Biology 60,469-475 (1974)
Published by Company of Biologists 1974

Neuromuscular Physiology of the Longitudinal Muscle of the Earthworm, Lumbricus Terrestris : III. Mapping of Motor Fields

C. D. DREWES ¹ and R. A. PAX ¹

¹ Department of Zoology, Michigan State University, East Lansing, Michigan, U.S.A., 48823

1. The motor fields of individual segmental nerves have been mapped electrophysiologically in the longitudinal muscle of the earthworm, Lumbricus terrestris.

2. The anterior pair of segmental nerves (SNI) innervates approximately the anterior two-thirds of its segment and a small portion of the segment just anterior to it.

3. The posterior pair of segmental nerves (SNII-III) innervates approximately the posterior two-thirds of its segment and a small portion of the segment just posterior to it.

4. Adjacent nerves (both intrasegmental and intersegmental) have partially overlapping motor fields; that is, adjacent segmental nerves innervate some of the same longitudinal muscle fibres.

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