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The facial paralysis can follow immediately the trauma due to direct damage to the facial nerve, in such cases a surgical treatment may be attempted. In other cases the facial paralysis can occur a long time after the trauma due to oedema and inflammation. In those cases steroids can be a good help.
The facial nerve is a mixed nerve (i.e. containing both sensory and motor nerve fibres) and therefore compression can create sensory (e.g. anesthesia - numbness, or paresthesia - tingling) and motor deficits.
Hypoesthesia or numbness is a common side effect of various medical conditions that manifests as a reduced sense of touch or sensation, or a partial loss of sensitivity to sensory stimuli. In everyday speech this is generally referred to as numbness.
Microvascular decompression (MVD), also known as the Jannetta procedure, [1] is a neurosurgical procedure used to treat trigeminal neuralgia (along with other cranial nerve neuralgias), a pain syndrome characterized by severe episodes of intense facial pain, and hemifacial spasm.
Furthermore, the extratemporal (outside temporal bone) facial nerve and its subsidiaries run through the parotid gland and innervate (supply nerves to) the face. This nerve articulates the muscles for facial expression as well as more specific muscles such as the postauricular muscles , the posterior (back or end) belly of the digastric muscle ...
The facial motor nucleus contains ventral and dorsal areas that have lower motor neurons that supply the upper and lower face muscles. When central facial palsy occurs, there are lesions in the corticobulbar tract between the cerebral cortex. Because of these lesions, the facial motor nucleus reduces or destroys input in the ventral division. [1]
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A common tradeoff when electing to a neurectomy is that numbness along the nerve distribution is expected. Studies that have measured how bothersome numbness is to patients have found that most patients are not bothered at all by the numbness, and the ones that are find the numbness minimally bothering. [16] [17]