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Definition of Ciliary muscle

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.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=10544
Last Editorial Review: 9/20/2012

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