The superior oblique muscle sends its tendon of origin through a pulley or trochlea before inserting on the globe. This muscle is responsible for abduction and depression of the eye. It also helps to rotate the eye inward (medially).
The tendon of the superior oblique muscle passes through a pulley that is formed by the inferior oblique muscle and the lateral rectus muscle. The pulley system allows the superior oblique muscle to change the direction of its pull on the eye. The superior oblique muscle inserts on the eye at the superolateral aspect of the globe. The muscle contracts to produce inferior and medial movement of the eye.
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