CLINICAL ENCOUNTERS
BELLS PALSY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which side of the face does CN VII innervate?
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Contralateral
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Ipsilateral
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Either A or B
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None of the above
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Explanation:
Detailed explanation-1: -The upper motor neuron (UMN) of the facial nerve is located in the primary motor cortex of the frontal lobe. UMN axons descend ipsilaterally as the corticobulbar tract via the genu of the internal capsule and reach the facial nucleus in the pontine tegmentum.
Detailed explanation-2: -Cranial nerve six, AKA the abducens nerve, innervates the ipsilateral lateral rectus muscle which abducts the ipsilateral eye. The sixth nerve nucleus is located in the pons, just ventral to the floor of the fourth ventricle.
Detailed explanation-3: -In central facial palsy, paralysis is contralateral to the lesion, and eyelid and forehead muscles are not affected!
There is 1 question to complete.