The oculomotor nerve is the third of twelve paired cranial nerves Cranial nerves are nerves that emerge directly from the brain stem in contrast to spinal nerves which emerge from segments of the spinal cord. Although thirteen cranial nerves in humans fit this description, twelve are conventionally recognized. The nerves from the third onward arise from the brain stem. Except for the tenth and the eleventh nerve,. It controls most of the eye's movement, constriction of the pupil, and maintains an open eyelid. (Note: cranial nerves IV and VI also participate in control of eye movement.)
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