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Quarterly Journal of Microscopical Science, Vol s3-102, 463-467, Copyright © 1961 by Company of Biologists
1 Department of Zoology and the Rheumatism Research Centre, University of Manchester; Department of Entomology, University of Minnesota, St. Paul 1, Minnesota, U.S.A.
2 Department of Zoology and the Rheumatism Research Centre, University of Manchester
The sheath is composed of an outer non-cellular layer, the neural lamella, and an inner layer of sheath cells. The neural lamella possesses a large number of collagen fibrils arranged in layers with differing orientations. The sheath cells are flattened on the inner surface of the lamella and the cytoplasm contains lipochondria, mitochondria, and small amounts of endoplasmic reticulum.