A healthy neuron with myelin sheath around the long, thin axon.
Symptoms of multiple sclerosis
Multiple sclerosis (MS) is a serious health condition that gets worse over time. In this disease, the body’s natural guard against illness (the immune system) damages fatty coverings called myelin sheaths around the nerve cells (neurons) in the central nervous system (CNS). The disease has different effects in different people, and can make people’s bodies, eyesight, speech, and minds work poorly. People with MS do not normally live as long as healthy people.