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专业 诚信 领先
专业 诚信 领先
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What is the facial nerve? (facial nerve is marked by yellow color in above pic) The facial nerve is a specific motor nerve (a nerve which tells certain muscles to contract) which controls the muscles on the same side of the face. It allows us to show expression, smile, cry, and wink. Injury to the facial nerve causes a socially and psychological devastating physical defect that may require multiple rehabilitative procedures. The facial nerve is the seventh of the twelve cranial nerves which have been named as such because they all exit the brainstem through the base of the skull. Everyone has two facial nerves, one for each side of the face. The facial nerve travels with the hearing nerve (cranial nerve eight) as it travels in and around the structures of the middle ear. It exits the front of the ear at the stylomastoid foramen (a hole in the skull base), where it then travels through the parotid gland. In the parotid gland it divides into many branches which provide motor function for the various muscles and glands of the head and neck. Some reasons such as cold, fatigue, depress and virus infection can lead to innercanal facial nerve edema. the later will make the nerve entrapment which can block the nerve conduction and cause the facial palsy. |
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