The darkly pigmented posterior zone of the ciliary body continuous with the retina at the ora serrata. SYN: ciliary disk, ciliary ring, pars plana. [Mod. L.]
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orbiculus cil·i·ar·is -.sil-ē-'er-əs n a circular tract in the eye that extends from the ora serrata forward to the posterior part of the ciliary processes called also ciliary ring, pars plana
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[TA] ciliary disk: the thin part of the ciliary body extending between its crown and the ora serrata retinae; called also pars plana corporis ciliaris.Medical dictionary. 2011.