Medical Definition of Myelin

Myelin: The fatty substance that covers and protects nerves. Myelin is a layered tissue that surrounds the nerve fibers (axons). This sheath around the axons acts like a conduit in an electrical system, ensuring that messages sent by axons are not lost en route.

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The abbreviated term ADHD denotes the condition commonly known as: See Answer

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Reviewed on 12/12/2018