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

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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.

Additional images

Horizontal section of the eyeball.

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

Vestibulo-ocular reflex

External links

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

v • d • e List of muscles of head and neck: the head
Extraocular (CN III, IV, VI)	oblique (inferior, superior) - rectus (superior, inferior, medial, lateral) - levator palpebrae superioris (superior tarsal)
Mastication (CN V3)	masseter - temporalis - pterygoid (lateral, medial)
Facial (CN VII)	Ear auriculares (anterior, superior, posterior) - temporoparietalis Scalp/eyelid occipitofrontalis (occipitalis, frontalis) - orbicularis oculi (depressor supercilii) - corrugator supercilii Nose procerus - nasalis (dilatator naris) - depressor septi nasi - levator labii superioris alaeque nasi Mouth levator anguli oris - levator labii superioris - zygomaticus (major, minor) orbicularis oris - risorius - buccinator depressor anguli oris - depressor labii inferioris - mentalis
Mouth/throat (CN IX, X, XI) (except TVP=V3)	Soft palate veli palatini (tensor, levator) - musculus uvulae - palatopharyngeus (to pharnyx) - palatoglossus (to tongue) Pharynx pharyngeal constrictor (superior, middle, inferior) - longitudinal (stylopharyngeus, salpingopharyngeus) Larynx cricothyroid - cricoarytenoid (posterior, lateral) - arytenoid (oblique arytenoid/aryepiglottic, transverse arytenoid) - thyroarytenoid (vocal, thyroepiglottic)
Tongue (CN XII)	extrinsic (genioglossus, hyoglossus/chondroglossus, styloglossus) - intrinsic (superior longitudinal, inferior longitudinal, transverse, vertical)

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