Sclerosis literally means hardening. It describes a process where healthy, soft tissue is replaced by hard, scar - like connective tissue, usually due to chronic inflammation or injury.
Sclerosis in the Brain The Attack: Your immune system mistakenly attacks the myelin sheath (the insulation created by glial cells)
The Damage: This is stripping away of myelin is called demyelination
The Sclerosis: as the body tries to heal, it leaves behind tough, fibrous scar tissue called plaques or lesions
The Result: Because these hard scares replace the smooth myelin, the electrical signals (thoughts/movements) get slowed down, distorted, or blocked