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.
Demyelination is the process in which the myelin sheath -- a protective, insulating layer surrounding nerve fibers in the brain and spinal cord -- is damaged or destroyed.
From Science Daily • Jan. 6, 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
In MS, the immune system mistakenly attacks the myelin sheath, a protective layer that insulates nerve fibers.
From Science Daily • Oct. 11, 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
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
