controls the size of the pupil.
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Control the Size of Pupil;
The size of the pupil is controlled by the activities of two muscles:
the circumferential sphincter muscle found in the margin of the iris, innervated by the parasympathetic nervous system: and the iris dilator muscle, running radially from the iris root to the peripheral border of the sphincter
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The size of pupil is controlled by the iris muscles.
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