Syndrome, Marin-Amat

A form of acquired facial synkinesis manifesting as involuntary eyelid closure on jaw opening. Often follows an aberrant regeneration of the facial nerve after a peripheral facial palsy.

Mechanism

Eyelid closure occurs due to orbicularis oculi (CN VII) contraction rather than inhibition of levator palpebrae superioris (CN III) as is seen in inverse Marcus Gunn phenomenon

Pearls