Medial rectus muscle
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Figure showing the mode of innervation of the Recti medialis and lateralis of the eye.
|Origin||annulus of Zinn at the orbital apex|
|Insertion||5.5 mm medial to the limbus|
|Nerve||inferior division of the oculomotor nerve|
|Actions||adducts the eyeball (makes it move inwards)|
|Latin||musculus rectus medialis bulbi|
|Anatomical terms of muscle|
This muscle shares an origin with several other extrinsic eye muscles, the anulus tendineus, or common tendon.
It is the largest of the extraocular muscles and its only action is adduction of the eyeball. Its function is to bring the pupil closer to the midline of the body. It is tested clinically by asking the patient to look medially.
Eye movement of medial rectus muscle, superior view.
- Anatomy figure: 29:01-06 at Human Anatomy Online, SUNY Downstate Medical Center
- lesson3 at The Anatomy Lesson by Wesley Norman (Georgetown University) (orbit4)
- Diagram at howstuffworks.com
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