My understanding is that the receptors on the muscles that receive the chemical message from the nerves are attacked by T-cells that have been instructed by our immune systems that the receptors are foreign bodies and they must get rid of them. Some of our receptors are destroyed but many more are damaged, but not destroyed. Our bodies cannot regrow new receptors, but they can heal the damaged ones.

This Is exactly the question I asked when, about 5 years into my journey with mg, I realized that my left eyelid which had drooped so badly when I was first diagnosed was doing just fine, but now my right eyelid was drooping badly. How could this be? My internist did some research for me and explained it to me in plain English. My neuro tried, but I just didn't understand his medical mumbo-jumbo. Actually, I think my internist called my neuro (they're friends) and translated it for me.

Hope this helps!

Juanita