Myasthenia gravis is caused by damage to the myelin sheath around a nerve.

Name: Myasthenia gravis is caused by damage to the myelin sheath around a nerve.
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Myasthenia gravis is actually caused by an autoimmune disorder in which antibodies attack and damage the receptors for acetylcholine (a neurotransmitter that signals muscle contractions) at the neuromuscular junction, which leads to muscle weakness and fatigue. It is not caused by damage to the myelin sheath around nerves.

Myasthenia Gravis Is Caused by Damage to the Myelin Sheath