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White matter of the brain

Reviewed By David C. Dugdale III, MD, Professor of Medicine, Division of General Medicine, Department…more »

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The white matter of the brain contains nerve fibers. Many of these nerve fibers (axons) are surrounded by a type of fat called myelin. The myelin gives the whitish appearance to the white matter. Myelin acts as an insulator, and it increases the speed of transmission of all nerve signals.

Date Last Reviewed: 02/22/2009
Copyright: ADAM Health Illustrated Encyclopedia

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