Professional
Technical
IVT
Marcus Gunn jaw winking
Pronunciation: MAR-kus gun
Congenital synkinesis causing eyelid elevation with jaw movement.
Full Definition
A congenital neurological condition characterized by involuntary elevation of a ptotic eyelid during jaw movements, particularly when opening the mouth or chewing. Results from aberrant innervation between the trigeminal nerve and the levator palpebrae superioris muscle. Most commonly affects the upper eyelid unilaterally and may be associated with amblyopia if the ptosis is significant. Named after Robert Marcus Gunn who first described the phenomenon in 1883.
Usage
Usage note: Capitalize both Marcus and Gunn; hyphenate 'jaw-winking' when used as a compound modifier.
In Context
- "The infant demonstrated classic Marcus Gunn jaw winking with eyelid elevation during feeding." — Pediatric ophthalmology examination
- "Surgical correction of Marcus Gunn jaw winking requires careful consideration of the synkinetic movement." — Oculoplastic surgery consultation
Also known as
jaw-winking syndrome
Marcus Gunn phenomenon
Don't confuse with
mechanical ptosis
myasthenic ptosis