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It affects the sixth and seventh cranial nerves in the brain and those affected can't smile, frown or blink their eyes and can only move their eyes up or down.
According to one theory mentioned in the article, the uterine contractions triggered by misoprostol may lead to a bending of the fetus at the level of the sixth and seventh cranial nerves, causing a decrease in blood flow to developing muscles, bones, skin, and nerves.
It took only 35 or 40 doctor visits before we had a diagnosis: Michael couldn't suck, or close his mouth, or blink, or smile or move his eyes laterally because he had Moebius syndrome, a rare disorder characterized by paralysis of the sixth and seventh cranial nerves.