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 |
Actions
Edit
It depresses, adducts, and rotates laterally the eye.
InnervationEdit
As with most of the muscles of the orbit, it is innervated by the oculomotor nerve (Cranial Nerve III).
Additional imagesEdit
External linksEdit
- 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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