The Marin-Amat Syndrome is an acquired orofacial synkinesis with involuntary ptosis of the eyelid.
Features of Marin-Amat Syndrome:
(1) It is an acquired disorder that occurs following facial nerve injury.
(2) There is contraction of the orbicularis oculi muscle triggered by proprioceptive impulses associated with the stretching of jaw muscles.
(3) The patient experiences an involuntary unilateral ptosis when the jaw is openned wide or if the jaw is moved laterally.
It needs to be distinguished fro the Marcus Gunn jaw-winking phenomenon (MGJWP) and the inverse MGJWP.
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Condition
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Situation
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Muscle Action
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Marin-Amat Syndrome
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acquired
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contraction of orbicularis oculi muscle
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Marcus Gunn jaw winking phenomenon (MGJWP)
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congenital
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contraction of external pterygoid muscle and levator palpebrae superioris
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inverse MGJWP
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congenital
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inhibition of levator palpebrae superioris
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