Library · Disease
Multiple sclerosis
Make it clearer
Multiple sclerosis happens when the immune system, which exists to defend you, ends up damaging the brain and the spinal cord, which together make up the central nervous system. One of the targets of that attack is myelin, the sheath that wraps the nerve fibers that signals travel along. Think of the insulation on an electrical cord: when the insulation gets scraped away, the current runs late or stops getting through, and the wire inside, which here is the fiber itself, can be damaged too.
That damage does not happen at a single spot. It leaves plaques, also called lesions, scattered in different places in the brain and the spinal cord, and each person gets them in different places. That is why multiple sclerosis varies so much from one person to another: which problems show up and how the disease progresses vary widely. And it is chronic, meaning it stays with the person who has it over time.
In brief
Multiple sclerosis is a chronic disease in which the immune system damages the central nervous system: the brain and spinal cord.
One target is myelin, which surrounds nerve fibers. The damage can slow or interrupt signals, and the disease may also injure the fibers themselves.
Myelin acts as an insulating layer around the fibers; this helps explain signal conduction, not the entire disease.
Plaques, or lesions, can appear in different parts of the brain and spinal cord, which helps explain why symptoms and disease course vary so widely.
Sources (2)
- National Institute of Neurological Disorders and StrokeMultiple Sclerosis (MS)
- National Library of MedicineMultiple sclerosis
This page explains the topic in general terms; it does not tell anyone what treatment to follow.
Updated