Cranial Nerves Motor and Sensory Examination

What the Test Evaluates

The twelve cranial nerves emerge directly from the brain and brainstem and serve functions such as smell, vision, eye movement, facial sensation and movement, hearing, taste, swallowing, and tongue movement. During the examination, the clinician checks each nerve in turn to look for weakness, sensory loss, or other abnormalities.

How the Examination Is Performed

There is no blood draw or specimen collection. Instead, the clinician uses simple tools and techniques such as a penlight, a vision chart, a tuning fork, and small objects to test smell and taste. You may be asked to follow a moving target with your eyes, smile, clench your teeth, shrug your shoulders, and repeat words or sounds.

What You May Feel

The examination is generally painless and takes only a few minutes. Some parts, such as testing the gag reflex or corneal reflex, may feel briefly uncomfortable, but they are quick and safe. Let the clinician know if any maneuver causes pain or distress.

How Results Are Interpreted

Findings are described as normal or abnormal for each nerve rather than reported as numeric values. Abnormal results may prompt additional testing, such as imaging or laboratory studies, to identify the cause of the nerve dysfunction.