The size of the pupil is controlled by the__________
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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 pupil size is controlled by the dilator and sphincter muscles of the iris.
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