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FIGURE 17 Extraocular muscles and cranial nerves responsible for movements of right eye. (A) Extraocular muscles are controlled by three cranial nerves (III, IV, and VI). The levator palpebrae opens the eyelid and is innervated by cranial nerve III. (B) Horizontal gaze is controlled by paired contraction-relaxation of the medial rectus and lateral rectus muscles. (C) Vertical gaze is controlled by four muscles. Downward gaze is produced by inferior rectus and superior oblique muscles. Because of their placement on the eye, these muscles will also cause lateral and rotational movements, as well (indicated by orientation of the radial lines on the iris). Upward gaze is similarly controlled by the superior rectus and inferior oblique muscles.

superior oblique IV

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