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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.


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.

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

However, EBV infection has been linked to several diseases, including MS: an incurable, chronic autoimmune disease that causes the body's immune system to attack the myelin sheath of neurons in the brain and nervous system.

From Science Daily • May 28, 2024

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

"There may be a way to intervene so that you can increase the myelin sheath," he said.

From Science Daily • Jan. 14, 2024

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