Umn facial nerve palsy
How to differentiate central from peripheral causes for facial nerve palsy (and defining Bell's This is the classic "upper motor neuron" lesion of facial paralysis .
2 Feb Damage to the facial nerve - either upper motor neurone (UMN) or lower motor neurone (LMN) - produces weak muscles of facial expression.
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Description:This condition is often the result of damage of the upper motor neurons of the facial nerve. The discrepancy of the weakness between the upper and lower facial muscles are due to the bilateral corticonuclear innervation from the upper facial muscles and contralateral corticonuclear innervation to the lower facial muscles. Because of these lesions, the facial motor nucleus reduces or destroys input in the ventral division. These automatic reactions are impaired, and patients must learn these movements and remember mentally and physically the positions. Central facial palsy is often characterized by either hemiparalysis or hemiparesis of the contra-lateral muscles in facial expression. When central facial palsy occurs, there are lesions in the corticobulbar tract between the cerebral cortex. Any lesion affecting the individual branches temporal, zygomatic, buccal, mandibular and cervical is known as a lower motor neuron lesion.