Myasthenia Gravis is caused by an acetylcholine receptor deficiency at the neuromuscular junction.Ptosis may be an early and prominent sign of the disease.

• 摘要重症肌无力症因位于运动神经终板突触后之乙醯胆碱接受器减少所引起，眼睑下垂通常为早期明显的症状之一。