page_title: Marcus Gunn phenomenon
section_title: Presentation
hierarchical_section_title: Marcus Gunn phenomenon / Presentation
caption_attribution_description: English: A young woman demonstrating The Markus Gun Jaw Wink Phenomenon. The woman cannot control her eyelids while drinking. This is a particularly mild case.
context_page_description: Marcus Gunn phenomenon is an autosomal dominant condition with incomplete penetrance, in which nursing infants will have rhythmic upward jerking of their upper eyelid. This condition is characterized as a synkinesis: when two or more muscles that are independently innervated have either simultaneous or coordinated movements.
  Common physiologic examples of synkineses occur during sucking, chewing, or conjugate eye movements. There are also several abnormal cranial nerve synkineses, both acquired and congenital. Marcus Gunn jaw-winking is an example of a pathologic congenital synkinesis.
  First described by the ophthalmologist Marcus Gunn in 1883, this condition presents in approximately 5% of neonates with congenital ptosis. This condition has been associated with amblyopia, anisometropia, and strabismus.
caption: An affected young woman demonstrating The Marcus Gunn Jaw Wink Phenomenon. The woman cannot control her eyelids while sucking on a straw. This is a particularly mild case.
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