A layer of myelin encasing (and insulating) the axons of medullated nerve fibers.
1Axons without the medullary sheath are found in the sympathetic nerves.
2The investment of nerve fibers with a protective covering or medullary sheath, consisting of white, fat-like matter.
3Each one of the perforations is the entrance to an oblique tunnel, which is bored in the medullary sheath of the twig.
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Translations for medullary sheath