The ciliary body the structure behind the iris responsible for making aqueous humor, the fluid in the eye that nourishes the lens and cornea. The ciliary body is divisible into two parts: the pars plana and the pars plicata anteriorly.

The ciliary body is part of the uveal tract. In the diagram below, the uveal tract is shown in red (Iris, ciliary body, and choroid). The ciliary body is nourished by blood vessels which also supply the iris.

The ciliary body attaches to the iris at the iris root, and, at the ora serrata, posteriorly, the ciliary body joins the posterior continuation of the uvea, the choroid.

The ciliary body supports the lens through the zonules.ciliarybody_small

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