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a white fatty substance that forms a medullary sheath around the axis cylinder of some nerve fibers

a white fatty substance that forms a medullary sheath around the axis cylinder of some nerve fibers

The lipid-rich sheath investing many axons in both the central and peripheral nervous systems. The myelin sheath is an electrical insulator and allows faster and more energetically efficient conduction of impulses. The sheath is formed by the cell membranes of glial cells (SCHWANN CELLS in the peripheral and OLIGODENDROGLIA in the central nervous system). Deterioration of the sheath in DEMYELINATING DISEASES is a serious clinical problem.

1. White substance of Schwann, medullary substance. 2. Lipoid droplets formed during autolysis and postmortem degeneration.

Fatty substance surrounding a nerve.

A highly refracting fatty material forming the medullary sheath of nerve fibres.

Same as Medullary sheath.

Any one of a certain group of principles from nerve-substance.

A phosphatid present in brain and nerve tissue. Probably identical with escithin.

The material composing the white or medullated sheath of nerve fibers. [Gr.]