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myelin sheath

American

noun

Anatomy.

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

Etymology

Origin of myelin sheath

First recorded in 1895–1900

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

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

From Science Daily • Apr. 15, 2026

Their findings show that the immune system begins attacking the brain's protective myelin sheath -- the fatty covering that insulates nerve fibers -- much earlier than scientists once believed.

From Science Daily • Oct. 21, 2025

The research showed that MS first targets the myelin sheath.

From Science Daily • Oct. 21, 2025

In both aging mice and mice mimicking MS, the ESI1 treatment prompted myelin sheath production and improved lost neurological function.

From Science Daily • May 2, 2024

Projections from the oligodendrocyte wrap around the axon, forming a myelin sheath.

From Textbooks • Jan. 1, 2015

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023