Superior rectus muscle
View of the eye from above, showing the action of the superior rectus muscle.
|Latin||musculus rectus superior bulbi|
|Origin||annulus of Zinn at the orbital apex|
|Insertion||7.5 mm superior to the limbus|
|Actions||elevates, intorsion, and rotates medially the eye|
|Anatomical terms of muscle|
The superior rectus muscle is a muscle in the orbit. It is one of the extraocular muscles. It is innervated by the superior division of the oculomotor nerve (Cranial Nerve III). In the primary position (looking straight ahead), the superior rectus muscle's primary function is elevation, although it also contributes to intorsion and adduction.
The superior rectus muscle is the only muscle that is capable of elevating the pupil when it is in a fully abducted position.
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- "Eye Theory". Cim.ucdavis.edu. Retrieved 2012-12-02.