Ring of fibrous tissue around optic nerve at its entrance to the eye
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):
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] 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. PMID 30085520 . Retrieved 15 January 2022 . ^ synd/3938 Who Named It? ^ J. G. Zinn. Descriptio anatomica oculi humani. Göttingen, B. Abrami Vandenhoeck, 1755.
Fibrous tunic
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 Uvea / vascular (middle)
Retina (inner)
Anatomical regions
Other
