explain ciliary muscles with diagram
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Ciliary Muscle
The ciliary muscle is composed of smooth muscle fibers oriented in longitudinal, radial, and circular directions. Interweaving occurs between fiber bundles and from layer to layer, such that various amounts of connective tissue are found among the muscle bundles.1 The longitudinal muscle fibers (of Brücke) lie adjacent to the supraciliaris and parallel to the sclera. Each muscle bundle resembles a long narrow V, the base of which is at the scleral spur, whereas the apex is in the choroid. The tendon of origin attaches the muscle fibers to the scleral spur and to adjacent trabecular meshwork sheets. The insertion of the longitudinal ciliary muscle is in the anterior one third of the choroid in the form of stellate-shaped terminations or “muscle stars.”1,2 Inner to the longitudinal muscle fibers, the radial fibers form wider, shorter interdigitating Vs that originate at the scleral spur and insert into the connective tissue near the base of the ciliary processes1 This layer is a transition from the longitudinally oriented fibers to the circular fibers.
For more diagrammatic representation.
https://www.google.com/search?q=ciliary+muscles&client=tablet-android-lenovo&prmd=ivn&sxsrf=ACYBGNSv-YLPvzluw_i2XOGIBxST_cocAw:1574170654206&source=lnms&tbm=isch&sa=X&ved=2ahUKEwj8paPVsvblAhUI6nMBHd5pBWAQ_AUoAXoECBAQAQ&biw=600&bih=1024#
The innermost region of ciliary muscle, (Müller’s) annular muscle, is formed of circular muscle bundles with a sphincter type of action. These fibers are located near the major circle of the iris.
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