Medial rectus muscle
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| Medial rectus | ||
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| 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 |
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| 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
scalp/eyelid: occipitofrontalis (occipitalis, frontalis) - orbicularis oculi - corrugator supercilii - depressor supercilii
extraocular: levator palpebrae superioris - superior tarsal - rectus (superior, inferior, medial, lateral) - oblique (superior, inferior) - intraocular: ciliary - iris dilator - iris sphincter
ear: auriculares - temporoparietalis - stapedius - tensor tympani
nose: procerus - nasalis (dilatator naris) - depressor septi nasi - levator labii superioris alaeque nasi
mouth: levator anguli oris/depressor anguli oris - levator labii superioris/depressor labii inferioris - zygomaticus (major, minor) - mentalis - buccinator - orbicularis oris - risorius
mastication: masseter - temporalis - pterygoid (lateral, medial)
tongue: extrinsic (genioglossus - hyoglossus - chondroglossus - styloglossus) intrinsic (superior longitudinal - inferior longitudinal - transversus - verticalis)
soft palate: levator veli palatini - tensor veli palatini - musculus uvulae - palatoglossus - palatopharyngeus
pharynx: pharyngeal constrictor (inferior, middle, superior) - stylopharyngeus - salpingopharyngeus
larynx: cricothyroid - posterior cricoarytenoid - lateral cricoarytenoid - arytenoid - thyroarytenoid
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