In healthy people, myelin sheaths help neurons work. Electric signals in neurons move quickly through long, narrow axons like electricity in a wire. The myelin is like the insulator around the wire that keeps the signal strong by keeping it from moving out of the wire before the end. - In person with MS infiltration of immune cells induces inflammation within the CNS resulting in demyelination. The progressive degeneration of the myelin sheath, as well as the loss of myelin-producing cells oligodendrocytes, impair the ability of remyelination. Without the protective covering, the signals between neurons do not travel well. Because of this, the mind and body cannot work like they normally do.