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Orbicularis Oculi. Orbicularis means circular muscle and oculi means eye. This is a circular (sphincter) muscle that goes around the eye. Fibers anchor the frontal bone and maxillary bone and inserts into the eyelid so that when it contracts it closes the eye.he origin of this is the body of the mandible and the insertion is the skin/muscle of the lower lip. Note the triangularis/depressor anguli oris insertion is at the corner of the mouth while the depressor labii inferioris is more medial.
Summary of the Gross Anatomy of the Extraocular Muscles 49 Innervation of ExtraocularMuscles The medial, superior, and inferior rectus musclesand the inferior oblique muscle are all innervatedby cranial nerve III, the oculomotor nerve. This adjustability of pulleypositions and the different insertion sites of theglobal and orbital layers of extraocular musclesmay play a major but still undeï¬ned role in ocularkinematics. 8, 9, 30 The demonstration of muscle pulleys is incom-FIGURE 3â4.