| myelin | a white fatty substance that forms a medullary sheath around the axis cylinder of some nerve fibers |
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| myelin | a layer of myelin encasing (and insulating) the axons of medullated nerve fibers |
| myelin | (of neurons) covered with a layer of myelin |
| myelin | a nerve fiber encased in a sheath of myelin |
| myelin | a white fatty substance that forms a medullary sheath around the axis cylinder of some nerve fibers |
| myelin | of or relating to the substance that forms a sheath around the axon of some nerve fibers |
| myelin | the development of a myelin sheath around a nerve fiber |
| myelin | the development of a myelin sheath around a nerve fiber |