The ciliary muscle (is described) as containing three types of unstriped muscle fibers arising from the epichoroid and attaching to the scleral spur; radial fibers, situated more internally and anteriorly, arranged in the manner of a fan; circular fibers, continuous with, and inseparable from the radial fibers, running round the free edge of the ciliary body just behind the root of the iris. The ciliary muscle affects the shape of the lens in visual accomodation.