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quick opening and closing of the eyelids.
jaw winking involuntary closing of the eyelids associated with jaw movements.
a paradoxic movement of eyelids associated with movements of the jaw.
jaw winkingMarcus-Gunn phenomenon Neurology Elevation of a ptoptic eye by jaw movement, as seen in AD congenital ptosis, due to faulty innervation of levator palpebrae.
jaw wink·ing(jaw wingk'ing)
A paradoxic movement of eyelids associated with movements of the jaw.
jaw winkingAn inherited condition, also known as the Marcus Gunn syndrome, in which there is a drooping eyelid (ptosis) that retracts suddenly and momentarily when the mouth is opened wide or the jaw is moved firmly to one side. In some cases, the same stimulus causes a normal eye to close tightly. The condition is caused by an abnormal distribution of twigs of the motor nerves of the facial and jaw muscles. (R. Marcus Gunn, 1850–1909, Scottish ophthalmologist).
quick opening and closing of the eyelids. Called also eyelid snapping; usually done with much force.
involuntary closing of the eyelids associated with jaw movements.
big feature during the daily search for mares in heat in the breeding season; see vulvar winking (below).
uncontrolled movement of the vulva in a mare on heat. Usually accompanied by protrusion of the clitoris.