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• W320434202 abstract "Knowledge of variations in the morphology of normal myelinated peripheral nerve fibres is fundamental to subsequent interpretation of neuropathology. It would be advantageous for structural analysis of normal variations to be based on entire myelin internodes, but acquisition of such data via the classic approach of nerve fibre teasing has been hindered by limitations in optical resolution and specimen preparation. This study addressed these limitations through a new confocal imaging method which permits detailed visualisation of individual myelinated fibres in intact peripheral nerve trunks, and quantitated previously unrecognised patterns of morphological variation within normal internodes. The study focused particularly on Schmidt-Lanterman incisures, the narrow cytoplasmic channels which traverse normal compact myelin and provide foci for disruption of the compact sheath in a number of peripheral neuropathies. Analysis was based on confocal fluorescence images of multiple sequential internodes, traced within posterior tibial nerve trunks of adult male Sprague-Dawley rats. The strength of relationships between internodal size variables (length, fibre diameter, myelin sheath thickness) and total number of incisures per internode were documented. Each internode was divided into 4 regions of equivalent length (regions 1-4), and variations in the distribution of incisures and Schwann cell nuclear location were evaluated. Regional variations were consistent, irrespective of differences in fibre diameter, myelin sheath thickness, and internodal length. Expressed in terms of proximodistal orientation, there was a unimodal distribution of incisures within internodes of this fibre population (diameter range 5-9 microns), with region 3 containing the highest number of incisures and region 4 the lowest (P < 0.05). The Schwann cell nucleus was located more frequently in region 3 than in region 2 (P < 0.01). Contrary to previous reports, an incisure was found in close association with the nucleus in at least 50% of internodes. Documentation of frequent incisure-nuclear association and consistent patterns of variation within internodes extends knowledge of the microanatomy of normal peripheral nerve, and may provide insight into the functional role of incisures. Demonstration of such patterns in normal nerve may contribute to the understanding of pathological change, for example progression of ovoid formation from midinternodal regions during wallerian degeneration." @default.
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• W320434202 date "1995-10-01" @default.
• W320434202 modified "2023-09-23" @default.
• W320434202 title "Patterns of morphological variation within myelin internodes of normal peripheral nerve: quantitative analysis by confocal microscopy." @default.
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