Superior rectus muscle
| Superior rectus | |
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| Rectus muscles: 2 = superior, 3 = inferior, 4 = medial, 5 = lateral Oblique muscles: 6 = superior, 8 = inferior Other muscle: 9 = levator palpebrae superioris Other structures: 1 = Annulus of Zinn, 7 = Trochlea, 10 = Superior tarsus, 11 = Sclera, 12 = Optic nerve |
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| Sagittal section of right orbital cavity. | |
| Latin | musculus rectus superior bulbi |
| Gray's | subject #227 1022 |
| Origin | annulus of Zinn at the orbital apex |
| Insertion | 7.5 mm superior to the limbus |
| Artery | |
| Nerve | oculomotor nerve |
| Actions | elevates, intorsion, and rotates medially the eye |
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.
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[edit] Testing
The superior rectus muscle is the only muscle that is capable of elevating the pupil when it is in a fully abducted position.[1]
[edit] Additional images
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Eye movement of lateral rectus muscle, superior view
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Eye movement of medial rectus muscle, superior view
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Eye movement of inferior rectus muscle, superior view
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Eye movement of superior rectus muscle, superior view
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Eye movement of superior oblique muscle, superior view
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Eye movement of inferior oblique muscle, superior view
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Anterior view
credit: Patrick J. Lynch
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The sinuses at the base of the skull.
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Dissection showing origins of right ocular muscles, and nerves entering by the superior orbital fissure.
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The right eye in sagittal section, showing the fascia bulbi (semidiagrammatic).
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Superior rectus muscle
[edit] References
[edit] External links
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