The nurse is assessing the facial nerve (Cranial Nerve VII).
The anterior two-thirds of the tongue's stapedius muscle, facial expression muscles, and taste receptors are all supplied by the facial nerve. Asking the patient to use their facial muscles—such as raising their eyebrows, forcefully squeezing their eyes shut, smiling, and puffing up their cheeks—will help the doctor assess this nerve.
Facial muscle weakness can indicate either peripheral or central involvement depending on where it is located. A peripheral lesion or injury to the facial nucleus on the ipsilateral side, such as in Bell's palsy or a pontine infarct, are suggestive of a weakness with the entire right side of the face moving. A lesion above the facial nerve is suggested by a weakening in the lower part of the face with sparing of the forehead.
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