Emedicine facial nerve

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The most common cause of acute onset unilateral peripheral facial weakness is Bell's palsy. The incidence is lowest under 10 years of age and highest in people over the age of Left and right sides are affected equally.

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The first symptom of MRS is usually swelling of the upper lip, lower lip, one or both cheeks, eyelids, or rarely, one side of the scalp. The first episode may resolve in hours or days, but swelling may be more severe and last longer in subsequent episodes and can become permanent. The enlarged lips may appear cracked and discolored and can be painful.

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About Translations. In embryonic development, the trigeminal ganglia CN Vhistorically the semilunar ganglion, Gasser's ganglion or Gasserian ganglion is the first to become apparent and is the largest of the cranial nerves. Neural development is one of the earliest systems to begin and the last to be completed after birth.

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Proper eyelid closure and a normal blink reflex are essential to maintaining a stable tear film and a healthy corneal surface. Patients affected with lagophthalmos are unable to fully close their eyelids, and they may describe symptoms of dry and irritated eyes. Common morbidities of lagophthalmos are corneal exposure and subsequent keratopathy, which may progress to corneal ulceration and infectious keratitis.

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Bell's palsy is a type of facial paralysis that results in an inability to control the facial muscles on the affected side. The cause of Bell's palsy is unknown. The condition normally gets better by itself with most achieving normal or near-normal function.

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Internuclear ophthalmoplegia is characterized by paresis of ipsilateral eye adduction in horizontal gaze but not in convergence. It can be unilateral or bilateral. During horizontal gaze, the medial longitudinal fasciculus MLF on each side of the brain stem enables abduction of one eye to be coordinated with adduction of the other.

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Moebius syndrome is a rare neurological disorder characterized by weakness or paralysis palsy of multiple cranial nerves, most often the 6th abducens and 7th facial nerves. Other cranial nerves are sometimes affected. The disorder is present at birth congenital.

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The facial nerve is one of the key cranial nerves with a complex and broad range of functions. Although at first glance it is the motor nerve of facial expression which begins as a trunk and emerges from the parotid gland as five branches see facial nerve branches mnemonicit has taste and parasympathetic fibers that relay in a complex manner. The facial nerve is the only cranial nerve that may show normal post-contrast enhancement, although this applies only to the labyrinthine segment up to the stylomastoid foramen. Enhancement of the other segments of the facial nerve and other cranial nerves is considered pathologic.

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