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III Oculomotor nerve. Fibers run from the mid-brain to the eye. Supplies motor fibers to four of the six muscles that direct the eyeball, to the eyelid, and to the internal eye muscles controlling lens shape and pupil size.
The size of the pupil is controlled by muscles in the iris â the iris dilator. and the iris constrictor muscles. The muscles are controlled by nerves from the. brain to the eye. Problems with these nerves cause the size of the pupil to be.