Phenomenon, Marcus Gunn

Marcus Gunn phenomenon, AKA Marcus Gunn syndrome/Jaw-Winking syndrome/Marcus Gunn Ptosis/Maxillopalpebral Synkinesis, is a rare genetic disorder present at birth, characterized by movement of one upper eyelid in a rapid rising motion (open eyes) each time the jaw moves (contraction of ipsilateral lateral or medical pterygoid muscle).

Associated Syndrome

Marin-Amat syndrome
Phenomenon, Inverse Marcus Gunn