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Myelin

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

Definition

Myelin is an insulating layer that forms around nerves, including those in the brain and spinal cord. It is made up of protein and fatty substances. The purpose of the myelin sheath is to allow rapid and efficient transmission of impulses along the nerve cells. If the myelin is damaged, the impulses slow down. This can cause diseases like multiple sclerosis.

Date Last Reviewed: 05/21/2009
Copyright: ADAM Health Illustrated Encyclopedia

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