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.

Contents

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

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

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).

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List of muscles of head and neck: the head
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 - cricoarytenoid (posterior, lateral) - arytenoid - thyroarytenoid
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Retrieved from "http://en.wikipedia.org/wiki/Inferior_rectus_muscle"
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