Light micrograph of a cross-sectioned myelinated nerve stained with osmium tetroxide to show the myelin sheath of the nerve fibres. The thickness of the myelin sheath is proportional to the diameter of the fibre.

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Photo credit: © JOSE CALVO / SCIENCE PHOTO LIBRARY / Alamy / Afripics
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Keywords: -, axon, biological, biology, fiber, fibre, fibres, healthy, histological, histology, light, lm, micrograph, microscopy, myelin, myelinated, nerve, nervous, neuroanatomy, neurohistology, neurology, neuroscience, normal, osmium, sheath, system, tissue