Affected muscles:
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Orbicularis oculi - closes eye
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Levator labii superioris - raises upper lip
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Zygomaticus minor - raises upper lip, exposing maxillary teeth
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Occipitofrontalis - draws scalp anteriorly
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Orbicularis oris - closes and protrudes lips
Mechanism of Muscle Weakness:
A unilateral paralysis of the muscles of facial expression due to the damage or disease of the facial (VII) nerve.
Other Symptoms:
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Drooling
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Cannot wrinkle forehead, close the eye (left), or pucker lips
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Difficulty in swallowing