Medial rectus muscle

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Medial rectus
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
Figure showing the mode of innervation of the Recti medialis and lateralis of the eye.
Latin	musculus rectus medialis bulbi
Gray's	subject #227 1022
Origin:	annulus of Zinn at the orbital apex
Insertion:	5.5 mm medial to the limbus
Artery:
Nerve:	inferior division of the oculomotor nerve
Action:	adducts the eyeball (makes it move inwards)
Dorlands/Elsevier	m_22/12550510

The medial rectus muscle is a muscle in the orbit.

As with most of the muscles of the orbit, it is innervated by the inferior division of the oculomotor nerve (Cranial Nerve III).

This muscle shares an origin with several other extrinsic eye muscles, the anulus tendineus, or common tendon.

[edit] Additional images

Horizontal section of the eyeball.

Dissection showing origins of right ocular muscles, and nerves entering by the superior orbital fissure.

[edit] External links

• LUC mr
• GPnotebook -1476001712
• SUNY Figs 29:01-06
• Dictionary at eMedicine medial+rectus+muscle
• Norman/Georgetown lesson3 (orbit4)
• Diagram at howstuffworks.com