myelin sheath
Americannoun
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
The myelin sheath is a protective coating that surrounds nerve fibers in the brain and spinal cord.
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
Although existing treatments can help reduce inflammation, there are still no approved therapies that protect neurons or rebuild the damaged myelin sheath.
From Science Daily • Oct. 11, 2025
The thicker this myelin sheath, the faster the transmission.
From Science Daily • Mar. 6, 2024
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
