Why is the levator palpebrae muscle of myasthenia gravis patients most vulnerable? The first common symptom of myasthenia gravis patients is ptosis, But its mechanism is not clear. Some scholars believe that the levator palpebrae superior muscle is different from other extraocular muscles. For fast shrinkage fibers, It has a high anti-fatigue property and is a muscle fiber that is not innervated by multiple nerves. The levator palpebrae superior muscle has been stimulated by nerve impulses when opening eyes, so its compensation space is small under pathological conditions, and the [reserve] to deal with pathological changes is insufficient, resulting in the safety factor of neuromuscular transmission being easily affected and more easily fatigued than other muscles. Some studies have also Read More …