基本上看到臉部有不對稱的發生，要先分別是腦部或單純是周邊神經引起的。
Sparing of the forehead muscles is suggestive of a central (upper motor neuron) lesion because of bilateral innervation to this area. (但這個方式不一定準確)
Central activation of the facial nerve is both volitional and automatic or emotional in origin, and the facial nerve is the final common pathway. Thus, dissociation of movement of the face to command from spontaneous movement, as in smiling, indicates an upper motor neuron lesion. Lack of dissociation (absence of both voluntary and spontaneous movement) indicates a lower motor neuron (peripheral) lesion.
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Bell's palsy typically presents with the sudden onset (usually over hours) of unilateral facial paralysis. Common findings include the eyebrow sagging, inability to close the eye, disappearance of the nasolabial fold, and the mouth drawn to the non affected side . Associated manifestations may include decreased tearing, hyperacusis, and/or loss of taste sensation on the anterior two-thirds of the tongue.
The diagnosis of Bell's palsy is based upon the following criteria:
There is a diffuse facial nerve involvement manifested by paralysis of the facial muscles, with or without loss of taste on the anterior two-thirds of the tongue or altered secretion of the lacrimal and salivary glands.
Onset is acute, over a day or two; the course is progressive, reaching maximal clinical weakness/paralysis within three weeks or less from the first day of visible weakness; and recovery or some degree of function is present within six months.
* 由此疾病，可知顳顎關節處的不正常，對眼、耳、口都有相當的關連性.
以下的網頁有更深入的說明
Bell's palsy 貝爾氏麻痺 @ 快樂小藥師 Im pharmacist nichts glücklich :: 痞客邦 PIXNET :: - http://goo.gl/neALY
Untitled Document - http://goo.gl/BjH5g
