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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
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Ocular muscle involved in Marcus Gun jaw winking phenomenon is -
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The correct answer is  Congenital synkinetic ptosis (Marcus Gunn jaw winking ptosis). In this condition there occurs retraction of the ptotic lid with jaw movements i.e., with stimulation of ipsilateral pterygoid muscle. It is due to the mixing of the fibres of 5th and 3rd cranial nerves. Ref:AK Khurana 4thE pg356