The name multiple sclerosis refers to scars (scleroses—better known as plaques or lesions) particularly in the white matter of the brain and spinal cord, which is mainly composed of myelin.

There’s no single test that can diagnose multiple sclerosis. Instead ... the myelin that protects the nerve fibers in the spinal cord and brain. If you or someone you love is experiencing ...

Multiple sclerosis (MS) is an autoimmune disease. The body’s immune system mistakenly attacks a substance called myelin that surrounds and protects the nerves in the brain and spinal cord.