myelin sheath

American  

noun

Anatomy.

1. a wrapping of myelin around certain nerve axons, serving as an electrical insulator that speeds nerve impulses to muscles and other effectors.

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Etymology

Origin of myelin sheath

First recorded in 1895–1900

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Example Sentences

See Examples For:

myelin sheath

That timing appears to be essential for producing enough mature oligodendrocytes to properly restore the damaged myelin sheath.

From Science Daily ● Aug. 14, 2026

MS is a disease of the brain and central nervous system, in which the immune system mistakenly attacks the fatty myelin sheath that normally protects the nerves, like insulation around electric wires.

From BBC ● May 29, 2026

These metabolites support the growth and maturation of oligodendrocytes, which in turn helps rebuild the myelin sheath.

From Science Daily ● Apr. 15, 2026

To test this idea, Zhang and his team examined whether the mutation could protect the myelin sheath.

From Science Daily ● Apr. 15, 2026

In MS, the immune system mistakenly attacks the myelin sheath, a protective layer that insulates nerve fibers.

From Science Daily ● Oct. 11, 2025

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