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Acta Neuropathol


Title:A quantitative assessment of myelin sheaths in the peripheral nerves of dystrophic, quaking, and trembler mutants
Author(s):Beuche, W. Friede, R. L.
Address:
Year:1985
Journal Title:Acta Neuropathol
Page Number:29-36
Language:eng
Volume:66
Issue:1
ISSN/ISBN:0001-6322 (Print). 0001-6322 (Linking)
Abstract:If myelin sheaths are relatively thin for axon caliber, this is generally taken as a sign of insufficient myelin formation. However, recent studies have shown that sheath thickness relates not only to axon caliber; the relative length of the internode is also important. Foreshortened internodes have slightly thinner sheaths than long internodes of the same fiber caliber (Friede and Bischhausen 1982). In the present study we compared sheath thickness with internode geometry in the sciatic fibers of three murine mutants, the Dystrophic, Quaking and Trembler mice, using a new computer-assisted method. A quantitative correspondence was found between abnormally thin sheaths and internode foreshortening. The magnitude of the changes was the same as that found previously in normal and regenerated fiber populations. The data show that the geometric proportions of internodes cannot be ignored when assessing sheath thickness, and they also shed some new light on the mechanisms which produce abnormally thin sheaths.

 
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