In MS, the amount and quality of myelin is abnormal, replaced by “sclerotic” plaques, the hallmark of the disease.
also myeline, "soft material found in nerve tissues," 1867, from German Myelin (1854), from Greek myelos "marrow; the brain, innermost part," of unknown origin.
myelin my·e·lin (mī'ə-lĭn) or my·e·line (-lĭn, -lēn')
A white fatty material composed chiefly of alternating layers of lipids and lipoproteins that encloses the axons of myelinated nerve fibers.
Droplets of lipid formed during autolysis and postmortem decomposition.