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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.
Best Answer: 1. Dilator pupillae-dilator (radial) muscle-innervated by sympathetic nervous system (Alpha-1 receptors)- increases the size of pupil (mydriasis) 2.Constrictor (circular muscle) pupillae-constricts the pupil (miosis) ex during accommodation reflex.eport Abuse. Radial muscles and circular muscles. When the radial muscles contract the size of the pupil is increased. When the circular muscles contract the size of the pupil is decreased.