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Cranial Nerve VII
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Facial Nerve Clinical Notes and Interpretation
  • Cortical lesions are contralateral because facial nerve muscles receive innervation from both hemispheres.
  • Brainstem lesions are ipsilateral .
  • The upper facial nucleus receives bilateral innervation to the muscles of the upper quadrant of the face, but the lower facial nucleus receives only contralateral innervation.
  • A PNS lesion will result in weakness in the ipsilateral facial muscles and loss of taste from the ipsilateral anterior two-thirds of the tongue.
  • A PNS lesion is differentiated from a CNS dysfunction in that a patient with a CNS lesion will retain the ability to wrinkle the forehead or raise the eyebrows.

 

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Section: Cranial Nerve VII
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Page 5 of 6
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