How does demyelination cause symptoms

How does demyelination cause symptoms? 

When myelin is stripped away from the axon, the underlying membrane does not contain a high enough concentration of sodium, potassium, and other ionic channels to permit a sufficient flow of ions to cause depolarization.

The membrane thus becomes inert.

The loss of myelin makes it impossible to depolarize the membrane to conduct an action potential, so the nerve is rendered useless.

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