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Various types of simple collector channel (CC) orifices in the outer wall of Schlemm's canal. (A) Representative image showing a simple orifice with thickened rim surrounding entire CC opening. (B) Transected orifice showing lip-like rim (white arrow) in association with a CC. (C) Underlying matrix of orifice rim denuded of endothelium. Arrow points to circumferential fibers at orifice rim.
