Educational Content: This article is for informational purposes only and does not constitute medical advice. Always consult a healthcare provider for diagnosis and treatment.

Definition of White matter

Medically reviewed by Dr. Otari Nergadze, Neurosurgeon | Updated: January 2026

White matter: The part of the brain that contains myelinated nerve fibers. The white matter is white because it is the color of myelin, the insulation that covers nerve fibers.

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