Under a microscope, a biopsy of the tissue shows changes in the muscle itself but not in the nerve or neuromuscular junction.

在显微镜下，活检组织显示了肌肉本质的改变，而非神经或神经肌肉接头。

First you've got your motor neurons that release the neurotransmitter acetylcholine at the neuromuscular junction, which then binds to nicotinic acetylcholine receptors on muscle cell membranes.

首先，你的运动神经元在神经肌肉接头处释放神经递质乙酰胆碱（ACh），然后与肌肉细胞膜上的N胆碱受体相结合。