Test Sensory Function

The sensory function of the trigeminal nerve is tested by asking the patient to close the eyes and to respond when a touch is felt. A piece of gauze is brushed against one side of the forehead and then the corresponding position on the other side. This test is then performed on the cheeks and the jaw, so that all three subdivisions of the nerve are tested. The patient is also asked whether one side feels the same as or different from the other side. The examination is demonstrated in Figure 21-12.

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