Name 5 muscles that are affected and list their action.
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Orbicularis oculi- closes eyelids, compresses lacrimal sac
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Orbicularis oris- multiple action but more on lips shaping
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Buccinator- lateral movement of cheeks
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Platysma- depresses mandible and mouth angle, tenses skin of the lower face and anterior neck
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Zygomatic major- lateral elevation of the corners of the mouth, modifies the nasolabial furrow
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Describe the mechanism of his muscle weakness.
Facial muscles can become weak and paralyzed if a facial nerve that carries messages to the associated facial muscles is damaged.
What other symptoms could the patient exhibit as a result of the facial muscle weakness?
Damage and infection to the eye causing visual loss due to dryness. Aside from that, a permanent damage to the facial nerve may occur as well as the permanent facial involuntary contractions.