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Question

Testing for neurological function involves a series of tests of functions associated with the cranial nerves. What functions, and therefore which nerves, are being tested by asking a patient to follow the tip of a pen with their eyes?

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Usually, the patient is asked to follow the movement of a pen in an ``H'' pattern. This tests all the muscles of the eye. The cranial nerves involved in innervating the eye muscles are CN 3, 4, and 6.

\bullet. CN 3 - innervates the superior rectus, medial rectus, and inferior oblique that elevates, adduct, and does extorsion of the eye, respectively. \bullet. CN 4 - innervates superior oblique muscle which moves the eye down and inward. \bullet. CN 6 -innervates the lateral rectus muscle which allows the eye to move laterally.

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