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Abnormal sensation to sharp/dull testing on the left cheek would likely indicate an issue with which cranial nerve?

  1. Cranial nerve V

  2. Cranial nerve XI

  3. Cranial nerve VI

  4. Cranial nerve X

The correct answer is: Cranial nerve V

The presence of abnormal sensation to sharp/dull testing on the left cheek suggests that there is a problem with the sensory function of the area of the face being tested. The cranial nerve primarily responsible for sensation in the face is the trigeminal nerve, also known as cranial nerve V. This nerve is divided into three branches: the ophthalmic, maxillary, and mandibular branches, with the maxillary branch specifically supplying sensation to the cheek region. When there is an abnormality detected during sharp/dull testing, it typically indicates a dysfunction or injury related to the sensory pathways of the trigeminal nerve, affecting the perception of tactile stimuli in that area. This can manifest as decreased sensitivity, altered sensation, or even pain. In contrast, other cranial nerves listed do not play a primary role in facial sensation. Cranial nerve XI is involved in neck movement; cranial nerve VI controls lateral eye movement; and cranial nerve X primarily regulates functions in the throat and autonomic systems. Therefore, the identification of abnormal sensation in the left cheek directly correlates with a potential issue in the trigeminal nerve, making it the correct answer in this scenario.