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 |
[edit] Actions
It depresses, adducts, and rotates laterally the eye.
[edit] Innervation
As with most of the muscles of the orbit, it is innervated by the oculomotor nerve (Cranial Nerve III).
[edit] 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). |
[edit] External links
- LUC ir
- SUNY Figs 29:01-07
- Dictionary at eMedicine inferior+rectus+muscle
- Norman/Georgetown lesson3 (orbit5)
- Diagram at mun.ca
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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