Where is the ciliary muscle of the eye

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Verify now. Toggle navigation. Institutional subscriptions support Language. Keep me signed in. Forgot your password? Sign in with Facebook. Sign in with Apple. This definition incorporates text from a public domain edition of Gray's Anatomy 20th U. Subscribe now Discover our subscription plans Subscribe. Anterior segment dysgenesis. Updated February 21, American Academy of Ophthalmology. Aqueous humor. Updated January 28, Emory Eye Center.

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We and our partners process data to: Actively scan device characteristics for identification. I Accept Show Purposes. Table of Contents View All. Table of Contents. Associated Conditions. Do I Need an Ophthalmologist or an Optometrist? Was this page helpful? Thanks for your feedback! Sign Up. What are your concerns? The other two parts are the iris the colored part of the eye , and the choroid the part of the eye that nourishes the retina.

These two segments are connected together by the ciliary body. Structurally, the ciliary body is a ring of tissue that surrounds the iris and connects it to the choroid.

The ciliary muscle , which influences the shape of the lens inside the eye. Contraction of the ciliary muscle makes the lens become more convex, enabling the eye to focus on near objects. The ciliary muscle is connected to the lens by a series of very thin, radially-arranged fibers called the ciliary zonules also called the zonular fibers or zonules of Zinn , which hold the lens in place within the eye. The ciliary processes , which are about 70 ridges in the ciliary body that contain cells involved in the production of the aqueous humor in the eye that controls eye pressure.

There are three main functions of the ciliary body: accommodation , holding the lens in place and producing aqueous fluid. This action depends on the ciliary muscle. The ciliary body holds the lens of the eye in place behind the pupil using tiny fibers called ciliary zonules or zonules of Zinn.

Aqueous fluid production occurs in the ciliary body. Aqueous fluid or aqueous humor is the clear fluid in the eye that provides nourishment and helps the eye maintain its shape as well as healthy pressure levels.