A phenomenon of eyelid closure on opening the mouth or with movements of mastication has been described by many.1-7 This synkinesis has been referred to as the "reversed or inverted Marcus Gunn phenomenon." It has also been known as the "Syndrome of Marin Amat." In the Marcus Gunn phenomenon, where the lids open when the mouth is opened, the levator is considered to have neural connections not only with the third nerve nucleus, but also with the external pterygoid part of the fifth nerve nucleus. In the present syndrome the orbicularis oculi was believed by most of the early writers to have intraneural connections between the fifth and seventh cranial nerves. The validity of this explanation has been questioned.3,9,10
Report of Case
A 20-year-old Caucasian hospitalman was admitted on April 11, 1960, to the U.S. Naval Hospital, Oakland, complaining of eyewinking while chewing.The past history revealed that
VIOLE AD, ERDBRINK WL. Lid Closure on Mouth Opening: A Synkinetic Intrafacial Movement. Arch Ophthalmol. 1961;65(6):798–800. doi:https://doi.org/10.1001/archopht.1961.01840020800008
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