: a soft white material that forms a thick layer around the axons of some neurons and is composed chiefly of lipids (such as cerebroside and cholesterol), water, and smaller amounts of protein
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This reversible reduction in MWF upon prolonged exercise and recovery after lowering physical activity strongly suggests changes in myelin structure and content that may open up a new view of myelin as an energy store ready to use when common brain nutrients are in short supply.
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New Atlas, 25 Mar. 2025
The researchers evaluated the association of B12 concentrations with cognitive performance and myelin integrity.
—New Atlas, 19 Feb. 2025
Biotin is thought to play a role in the creation of myelin, the protective layer surrounding nerves in the body.
—Kirstyn Hill, Pharmd, Mph, Health, 27 Sep. 2024
The particular cells imaged here are precursors to oligodendrocytes, cells that produce myelin in the body, the substance that forms protective sheaths around nerve fibers.
—Michael Franco, New Atlas, 21 Sep. 2024
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New Atlas, 25 Mar. 2025
The researchers evaluated the association of B12 concentrations with cognitive performance and myelin integrity.
—New Atlas, 19 Feb. 2025
Biotin is thought to play a role in the creation of myelin, the protective layer surrounding nerves in the body.
—Kirstyn Hill, Pharmd, Mph, Health, 27 Sep. 2024
The particular cells imaged here are precursors to oligodendrocytes, cells that produce myelin in the body, the substance that forms protective sheaths around nerve fibers.
—Michael Franco, New Atlas, 21 Sep. 2024
See All Example Sentences for myelin
Cite this Entry
“Myelin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/myelin. Accessed 4 May. 2025.
Copy CitationMedical Definition
myelin
noun
my·e·lin
ˈmī-ə-lən 
: a soft white material of lipid and protein that is secreted by oligodendrocytes and Schwann cells and forms a thick sheath about axons see myelin sheath
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