Medial rectus muscle
Figure showing the mode of innervation of the Recti medialis and lateralis of the eye.
|Latin||musculus rectus medialis bulbi|
|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)|
|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 lateral rectus muscle, superior view
Eye movement of inferior rectus muscle, superior view
Eye movement of superior rectus muscle, superior view
Eye movement of superior oblique muscle, superior view
Eye movement of inferior oblique muscle, superior view
- Origin, insertion and nerve supply of the muscle at Loyola University Chicago Stritch School of Medicine
- -1476001712 at GPnotebook
- Anatomy figure: 29:01-06 at Human Anatomy Online, SUNY Downstate Medical Center
- medial+rectus+muscle at eMedicine Dictionary
- lesson3 at The Anatomy Lesson by Wesley Norman (Georgetown University) (orbit4)
- Diagram at howstuffworks.com
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