oculomotor nerve

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Either of the third pair of cranial nerves, which originate in the midbrain and control most of the muscles that move the eyeballs.

Wiktionary

1. n. The third of twelve paired cranial nerves, which controls most of the eye's movements and constriction of the pupil and maintains an open eyelid.

WordNet 3.0

1. n. supplies extrinsic muscles of the eye