The oculomotor nerve arises from the brainstem and enters the dura mater to lie on the side wall of the cavernous sinus. The nerve enters the orbit through the superior orbital fissure.
The oculomotor nerve may be damaged as a result of a fracture of the base of the skull or of a disorder that distorts the brain, such as a tumor. Depending on the severity of the damage, the following symptoms may occur: ptosis (drooping of the upper eyelid), squint, dilation of the pupil, inability to focus the eye, double vision, and slight protrusion of the eyeball.
Related category ANATOMY AND PHYSIOLOGY
Source: British Medical Association
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