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<embedvideo service="youtube" Alignment="right">https://www.youtube.com/watch?v=ADPDMB9cY2Q</embedvideo>Jaw winking (Marcus Gunn phenomenon*) is an aberrant innervation syndrome that occurs when congenital ptosis is associated with abnormal communications between CN V and the levator palpebrae.(1-3) The ptotic lid opens and sometimes retracts when the mouth opens, with chewing or when the jaw is moved side to side (Video). When the jaw opens or moves laterally the lid pops open, when the jaw closes the lid winks closed. Jaw winking is considered a trigemino-oculomotor synkinesis due to misdirection of proprioceptive impulses from the pterygoid muscles to the oculomotor nucleus, and occurs in 2-13% of patients with congenital ptosis.1 In inverse jaw winking, the lid closes on opening the mouth.
Marin Amat syndrome sign is another condition in which the eye closes with mouth movements. It is a type of facial synkinesia due to facial nerve aberrant innervation causing eye closure with smiling or mouth opening. It occurs most often following Bell’s palsy with poor recovery and a profusion of misdirected axons from lower facial muscles to the orbicularis oculi. For an example see facial synkinesis at www.neurosigns.org.
A number of videos have been posted on the Internet of jaw-winking; [http://www.youtube.com/watch?v=jjvcNDimBc4 here is]
