Question

define ciliary muscles

Answer 1

The diameter of the pupil is regulated by the iris which can contract or relax by two sets of muscular fibers called ciliary muscles.

Answer 2

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Ciliary muscle: A circular muscle that relaxes or tightens the zonules to enable the lens to change shape for focusing. The zonules are fibers that hold the lens suspended in position and enable it to change shape during accommodation.

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