Inferior rectus muscle

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Inferior 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
Sagittal section of right orbital cavity.
Latin	musculus rectus inferior bulbi
Gray's	subject #227 1022
Origin:	annulus of Zinn at the orbital apex
Insertion:	6.5 mm inferior to the limbus
Artery:
Nerve:	inferior branch of oculomotor nerve
Action:	depression and adduction
Dorlands/Elsevier	m_22/12550484

The inferior rectus muscle is a muscle in the orbit.

Actions

It depresses, adducts, rotates laterally, and extorts the eye.

Innervation

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

Additional images

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

The right eye in sagittal section, showing the fascia bulbi (semidiagrammatic).

External links

• LUC ir
• SUNY Figs 29:01-07
• inferior+rectus+muscle at eMedicine Dictionary
• Norman/Georgetown lesson3 (orbit5)
• Diagram at mun.ca

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)

hu:Musculus rectus inferior

nl:Musculus rectus inferior ja:下直筋

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Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .