Medial rectus muscle

Medial rectus
Eyemuscles.png
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
Gray785.png
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
Actions adducts the eyeball (makes it move inwards)

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.

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.

Additional images


credit: Patrick J. Lynch

External links



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Look at other dictionaries:

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  • medial rectus — noun the ocular muscle whose contraction turns the eyeball medially • Syn: ↑medial rectus muscle, ↑rectus medialis • Hypernyms: ↑ocular muscle, ↑eye muscle …   Useful english dictionary

  • medial rectus — noun A muscle in the orbit of the eye. Syn: medial rectus muscle See Also: superior rectus, inferior rectus, lateral rectus …   Wiktionary

  • rectus muscle of eyeball medial — musculus rectus medialis bulbi …   Medical dictionary

  • Lateral rectus muscle — Muscle infobox Name = Lateral rectus Latin = musculus rectus lateralis bulbi GraySubject = 227 GrayPage = 1022 Caption = Rectus muscles: 2 = superior, 3 = inferior, 4 = medial, 5 = lateral Oblique muscles: 6 = superior, 8 = inferior Other muscle …   Wikipedia

  • Superior rectus muscle — Muscle infobox Name = Superior rectus Latin = musculus rectus superior bulbi GraySubject = 227 GrayPage = 1022 Caption = Rectus muscles: 2 = superior, 3 = inferior, 4 = medial, 5 = lateral Oblique muscles: 6 = superior, 8 = inferior Other muscle …   Wikipedia

  • Inferior rectus muscle — Muscle infobox Name = Inferior rectus Latin = musculus rectus inferior bulbi GraySubject = 227 GrayPage = 1022 Caption = Rectus muscles: 2 = superior, 3 = inferior, 4 = medial, 5 = lateral Oblique muscles: 6 = superior, 8 = inferior Other muscle …   Wikipedia

  • Medial eye fields — are areas in the frontal lobe of the primate brain that play a role in visually guided eye movement[1]. Most Neuroscientists refer to this area as the supplementary eye fields. Notes ^ Schiller PH, Chou IH. The effects of frontal eye field and… …   Wikipedia

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