Facial Nerve


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facial nerve

[′fā·shəl ‚nərv]
(neuroscience)
The seventh cranial nerve in vertebrates; a paired composite nerve, with motor elements supplying muscles of facial expression and with sensory fibers from the taste buds of the anterior two-thirds of the tongue and from other sensory endings in the anterior part of the throat.

Facial Nerve

 

(nervus facialis), the seventh pair of cranial nerves; a mixed nerve containing motor and sensory nerve fibers.

The nuclei of the facial nerve lie in the pons varolii. The conductors connected to these nuclei form the trunk of the facial nerve, which passes through the internal auditory meatus and the pyramid of the temporal bone to emerge from the cranial cavity through the stylomastoid foramen. The nerve divides into its terminal branches in the parotid gland.

The facial nerve’s motor conductors innervate the mimetic musculature, the stylohyoid muscle, the posterior venter of the digastric muscle, and the subcutaneous muscle of the neck. Its autonomic fibers innervate the salivary glands, the lacrimal glands, and the glands of the mucosae of the nasal cavity, palate, and upper pharynx. Its sensory fibers provide the gustatory innervation of the anterior two-thirds of the tongue. The autonomic and sensory fibers of the facial nerve in the vicinity of the brain stem form the nervus intermedius, the largest branch of which is called the chorda tympani. The most frequent pathology of the facial nerve is paralysis.

References in periodicals archive ?
Neoplastic Processes Affecting the Facial Nerve. A variety of neoplastic processes can affect facial nerve function.
For facial nerve crush injuries, all rats received intraperitoneal injections of ketamine (100 mg/mL; 0.1 mL/ 100 g body weight) and xylazine (20 mg/mL; 0.025 mL/ 100 g body weight).
Recovery of facial nerve functioning was complete or near complete, however, this parameter was not available for the patient with the pre-operative complete facial palsy.
The geniculate ganglion is the most common region affected by facial nerve schwannomas [9] and has been previously reported in a patient with intermediate neuron schwannoma that also affected the facial nerve [2].
The deep lobe of the parotid was excised en bloc with the facial nerve, due to tumor invasion.
In the immediate onset of facial nerve palsy after trauma, the nerve is either completely lacerated or contused at the fracture site (4,6).
The patient had House-Brackmann grade 2 temporary weakness on lower division of facial nerve. He was discharged from hospital after three days inpatient stay.
MVD exerts therapeutic effects by pushing offending vessels away from facial nerve roots with a cotton piece.
However, unilateral facial nerve palsy in the patient was noted before the transfer from the operation room to the post-anaesthesia care unit (PACU).
Surgical injury to the facial nerve following operation on the ear calls for an immediate exploration, unless the surgeon has identified the nerve during surgery and is sure that the nerve is intact in which case the paralysis is probably caused by oedema.
A specialist team from Khoula Hospital has restored the facial nerve of a two and a half year old boy who was hit with a sharp object at home.