There are muscles in the eyelid. I know for certain, the pretarsal portion of the orbicularis oculi goes right up to the eyelashes. For ten years, I got Botox injections directly into the eyelids to treat muscle spasms. There are definitely muscles in the eyelids, and needles into the eyelids is not as big a deal as it sounds.

I'm not certain, but I think the levator palpebrae superioris muscle is also in the eyelid, because when administering Botox injections for blepharospasm, the center of the eyelid must be avoided because of the levator muscle. When that muscle becomes weakened by Botox, the result is ptosis.

So if the EMG equipment never touched my eyelids, is it possible my levator is affected, but wouldn't have shown up on the EMG? Is it a different muscle than the levator that causes ptosis in myasthenia gravis?