Inferior Rectus Muscle Information
The inferior rectus muscle is a muscle in the orbit.
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Actions
It depresses, adducts, and helps extort (rotate laterally) the eye.
The inferior rectus muscle is the only muscle that is capable of depressing the pupil when it is in a fully abducted position.[1]
Innervation
As with most of the muscles of the orbit, it is innervated by the oculomotor nerve (Cranial Nerve III).
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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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).
References
- ^ "Eye Theory". Cim.ucdavis.edu. http://cim.ucdavis.edu/Eyes/eyeText.htm. Retrieved 2010-11-27.
External links
- LUC ir
- SUNY Figs 29:01-07
- inferior+rectus+muscle at eMedicine Dictionary
- lesson3 at The Anatomy Lesson by Wesley Norman (Georgetown University) (orbit5)
- Diagram at mun.ca
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Categories: Muscles of the head and neck | Eye |
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