الفهرس 
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Abstract
The facial nerve (seventh cranial nerve) innervates the orbicularis oculi muscle the main the protractor of the eye . Paralysis of orbicularis oculi muscle leads to inability to fully close the eye what is known lagophthalmos . Lagophthalmos is a symptom that brings many complications from disfigurement and simple keratitis to corneal ulcers and in some cases blindness