• Courtesy of Jill Foster, MD.
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    Oculoplastics/Orbit

    Marcus Gunn jaw-winking ptosis (synkinesis linking cranial nerve V to cranial nerve III). A, Relaxed position with ptosis of the left upper eyelid. B, Moving mandible to the left, the eyelid position remains low. C, Moving mandible to the right with elevation of the left upper eyelid.