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Yousun Koh

Muscles of the orbit (English)

Muscles of the orbit (English)

Lateral view of the left orbit (left image) and anterior view of the right orbit (right image) showing the positions of muscles of the orbit. The most superior muscle is the levator palpebrae superioris, originating from the lesser wing of the sphenoid bone and inserting on the superior tarsus and skin of the superior eyelid. Four straplike recti muscles (superior, inferior, medial and lateral rectus muscles) all originate from the common tendinous ring and run straight within the orbit to insert on the anterior half of the eyeball. The superior oblique muscle arises from the body of sphenoid bone and passes superomedially within the orbit, with its tendon running through the trochlea of the superior oblique, prior to inserting on the superior surface of the eyeball. The inferior oblique muscle is seen crossing the floor of the orbit below the inferior rectus muscle after arising from the maxillary bone, to insert on the inferior surface of the eyeball below the lateral rectus muscle.
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