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.
|myelin (mī'ə-lĭn) Pronunciation Key
A whitish, fatty substance that forms a sheath around many vertebrate nerve fibers. Myelin insulates the nerves and permits the rapid transmission of nerve impulses. The white matter of the brain is composed of nerve fibers covered in myelin.