Inferior rectus muscle
| Inferior rectus muscle | |
|---|---|
| File:Inferior rectus.png Extrinsic eye muscle. Inferior rectus muscle shown in red. | |
| Details | |
| Origin | Annulus of Zinn |
| Insertion | 6.5 mm inferior to the corneal limbus |
| Artery | Ophthalmic artery |
| Nerve | Oculomotor nerve (inferior branch) |
| Actions | Depresses, adducts, and extorts the eyeball |
| Antagonist | Superior rectus muscle |
| Identifiers | |
| Latin | musculus rectus inferior bulbi |
| TA98 | Lua error in Module:Wikidata at line 746: attempt to index field 'wikibase' (a nil value). |
| TH | {{#property:P1694}} |
| TE | {{#property:P1693}} |
| FMA | {{#property:P1402}} |
| Anatomical terms of muscle [[[d:Lua error in Module:Wikidata at line 865: attempt to index field 'wikibase' (a nil value).|edit on Wikidata]]] | |
The inferior rectus muscle is one of the six extraocular muscles that control the movements of the eye. It is responsible for the downward movement of the eye, as well as its adduction and extorsion.
Anatomy[edit | edit source]
The inferior rectus muscle originates from the Annulus of Zinn, a tendinous ring located at the apex of the orbit. It inserts approximately 6.5 mm inferior to the corneal limbus.
Innervation[edit | edit source]
The muscle is innervated by the inferior branch of the oculomotor nerve (cranial nerve III).
Blood Supply[edit | edit source]
The blood supply to the inferior rectus muscle is provided by the ophthalmic artery.
Function[edit | edit source]
The primary function of the inferior rectus muscle is to depress the eyeball. It also contributes to the adduction and extorsion of the eye. The muscle works in opposition to the superior rectus muscle, which elevates the eye.
Clinical Significance[edit | edit source]
Dysfunction of the inferior rectus muscle can result in strabismus, where the eyes do not properly align with each other. This can lead to double vision and other visual disturbances.
Related Pages[edit | edit source]
- Extraocular muscles
- Oculomotor nerve
- Superior rectus muscle
- Annulus of Zinn
- Ophthalmic artery
- Strabismus
 | This muscle article is a stub. You can help WikiMD by expanding it. |
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Credits:Most images are courtesy of Wikimedia commons, and templates Wikipedia, licensed under CC BY SA or similar.Contributors: Prab R. Tumpati, MD
