Common tendinous ring
Common tendinous ring | |
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![]() 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 = Common tendinous ring, 7 = Trochlea, 10 = Superior tarsus, 11 = Sclera, 12 = Optic nerve | |
![]() Anterior view | |
Details | |
Identifiers | |
Latin | anulus tendineus communis |
TA98 | A15.2.07.015 |
TA2 | 2047 |
FMA | 49071 |
Anatomical terminology [edit on Wikidata] |
The common tendinous ring, also known as the annulus of Zinn or annular tendon, is a ring of fibrous tissue surrounding the optic nerve at its entrance at the apex of the orbit. It is the common origin of the four recti muscles of the group of extraocular muscles.
It can be used to divide the regions of the superior orbital fissure.[1]
The arteries surrounding the optic nerve form a vascular structure known as the circle of Zinn-Haller, or sometimes as the circle of Zinn.[2]
The following structures pass through the tendinous ring (superior to inferior):
- Superior division of the oculomotor nerve (CNIII)
- Nasociliary nerve (branch of ophthalmic nerve)
- Inferior division of the oculomotor nerve (CNIII)
- Abducens nerve (CNVI)
- Optic nerve
Parts
The common tendinous ring spans the superior orbital fissure and can be described as having two parts – an inferior tendon which gives origin to the inferior rectus muscle, and to part of the lateral rectus muscle; and a superior tendon which gives origin to the superior rectus muscle, and to part of the medial and lateral recti muscles.[3]
Eponym
It is named for Johann Gottfried Zinn.[4][5] It should not be confused with the zonule of Zinn, though it is named after the same person.
References
- ^ Shi X, Han H, Zhao J, Zhou C (2007). "Microsurgical anatomy of the superior orbital fissure". Clin Anat. 20 (4): 362–6. doi:10.1002/ca.20391. PMID 17080461. S2CID 43849585.
- ^ Ko MK, Kim DS, Ahn YK (1999). "Morphological variations of the peripapillary circle of Zinn-Haller by flat section". Br J Ophthalmol. 83 (7): 862–6. doi:10.1136/bjo.83.7.862. PMC 1723100. PMID 10381675.
- ^ Shumway, Caleb L.; Motlagh, Mahsaw; Wade, Matthew (2022). "Anatomy, Head and Neck, Eye Inferior Rectus Muscle". StatPearls. StatPearls Publishing. Retrieved 15 January 2022.
- ^ synd/3938 at Who Named It?
- ^ J. G. Zinn. Descriptio anatomica oculi humani. Göttingen, B. Abrami Vandenhoeck, 1755.
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(outer)
Sclera | |
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Cornea |
![1:posterior segment 2:ora serrata 3:ciliary muscle 4:ciliary zonules 5:Schlemm's canal 6:pupil 7:anterior chamber 8:cornea 9:iris 10:lens cortex 11:lens nucleus 12:ciliary process 13:conjunctiva 14:inferior oblique muscule 15:inferior rectus muscule 16:medial rectus muscle 17:retinal arteries and veins 18:optic disc 19:dura mater 20:central retinal artery 21:central retinal vein 22:optic nerve 23:vorticose vein 24:bulbar sheath 25:macula 26:fovea 27:sclera 28:choroid 29:superior rectus muscle 30:retina](http://upload.wikimedia.org/wikipedia/commons/thumb/e/e8/Eye-diagram_no_circles_border.svg/200px-Eye-diagram_no_circles_border.svg.png)
tunic (middle)
Choroid | |
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Ciliary body | |
Iris |
Layers | |
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Cells |
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Other |
of the eye
Anterior segment | |
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Posterior segment |
- Keratocytes
- Ocular immune system
- Optical coherence tomography
- Eye care professional
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- Physiological Optics
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