Unilateral supranuclear lesion of facial nerve involves______________?
Correct answer: C. Only contra lateral lower part of the face
- A. Whole of face
- B. Only ipsilateral upper part of the face
- C. Only contra lateral lower part of the face
- D. Whole of lower face
Explanation
The upper facial muscles receive bilateral cortical input, whereas the lower facial muscles mainly receive input from the opposite cerebral hemisphere. A unilateral supranuclear lesion therefore causes weakness of the contralateral lower face with forehead sparing.
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