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Journal of Cell Science, Vol 7, 263-271, Copyright © 1970 by Company of Biologists

Submitted on September 17, 1969
Revised on January 27, 1970

Neuromuscular Junctions in the Body Wall Muscles of the Earthworm, Lumbricus Terrestris Linn

P. J. MILL 1 and M. F. KNAPP 1

1 Department of Zoology, University of Leeds, England

The fine structure of the neuromuscular Junctions in the body wall muscles of the earthworm is described. The segmental nerves send branches into the muscle layers. Axons in the nerve branches contain numerous synaptic vesicles and contact is established between these axons and muscle fibres or muscle tails; the latter may extend for a considerable distance from the muscle fibre. The cleft between the axolemma and sarcolemma is 85-120 nm wide and contains basement membrane material. At intervals small aggregations of electron-dense material are attached to the axonal membrane and synaptic vesicles are associated with these. The sarcolemma bears rather larger masses of dense material and is also specialized extracellularly.

Submitted on September 17, 1969
Revised on January 27, 1970






© The Company of Biologists Ltd 1970