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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2017/08/29 12:26:09」(JST)
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| Zonule of Zinn |
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Anatomy of the anterior part of the human eye. "Suspensory ligaments" are labeled at left.
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The upper half of a sagittal section through the front of the eyeball. (Zonule of Zinn visible near center.)
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| Details |
| Identifiers |
| Latin |
zonula ciliaris |
Dorlands
/Elsevier |
z_01/12870397 |
| TA |
A15.2.05.015 |
| FMA |
58838 |
| Anatomical terminology
[edit on Wikidata]
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The zonule of Zinn () (Zinn's membrane, ciliary zonule) (after Johann Gottfried Zinn) is a ring of fibrous strands forming a zonule (little band) that connects the ciliary body with the crystalline lens of the eye. These fibers are sometimes collectively referred to as the suspensory ligaments of the lens, as they act like suspensory ligaments.
Contents
- 1 Development
- 2 Anatomy
- 3 Clinical appearance
- 4 Additional images
- 5 References
- 6 External links
Development
The ciliary epithelial cells of the eye probably synthesize portions of the zonules.[1]
Anatomy
The zonule of Zinn is split into two layers: a thin layer, which lines the hyaloid fossa, and a thicker layer, which is a collection of zonular fibers. Together, the fibers are known as the suspensory ligament of the lens.[2] The zonules are about 1–2 μm in diameter.[3]
The zonules attach to the lens capsule 2mm anterior and 1 mm posterior to the equator, and arise from the pars plana region of the ciliary epithelium and pass forward closely related to the lateral surfaces of the ciliary process of the pars plicata.
When colour granules are displaced from the Zonules of Zinn (by friction against the lens), the irises slowly fade. In some cases those colour granules clog the channels and lead to Glaucoma Pigmentosa.
The zonules are primarily made of fibrillin, a connective tissue protein.[1] Mutations in the fibrillin gene lead to the condition Marfan syndrome, and consequences include an increased risk of lens dislocation.[1]
Clinical appearance
The zonules of Zinn are difficult to visualize using a slit lamp, but may be seen with exceptional dilation of the pupil, or if a coloboma of the iris or a subluxation of the lens is present.[4] The number of zonules present in a person appears to decrease with age.[3] The zonules insert around the outer margin of the lens (equator), both anteriorly and posteriorly.[5]
Additional images
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Structures of the eye labeled
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This image shows another labeled view of the structures of the eye
References
This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)
- ^ a b c Kaufman, Paul L.; Alm, Albert (2010). Adler's physiology of the eye (11th ed.). St. Louis, Mo: Mosby. pp. 145–146. ISBN 978-0-323-05714-1.
- ^ "Archived copy". Archived from the original on September 17, 2008. Retrieved January 12, 2008. [full citation needed]
- ^ a b Bornfeld, Norbert; Spitznas, Manfred; Breipohl, Winrich; Bijvank, Gerhard J. (1974). "Scanning electron microscopy of the zonule of Zinn". Albrecht von Graefes Archiv für klinische und experimentelle Ophthalmologie. 192 (2): 117–29. PMID 4548321. doi:10.1007/BF00410698.
- ^ McCulloch, C (1954). "The zonule of Zinn: Its origin, course, and insertion, and its relation to neighboring structures". Transactions of the American Ophthalmological Society. 52: 525–85. PMC 1312608 . PMID 13274438.
- ^ Farnsworth, P. N.; Mauriello, J. A.; Burke-Gadomski, P; Kulyk, T; Cinotti, A. A. (1976). "Surface ultrastructure of the human lens capsule and zonular attachments". Investigative ophthalmology. 15 (1): 36–40. PMID 1245377.
External links
- Diagram at unmc.edu
- Diagram at eye-surgery-uk.com
- Diagram and overview at webschoolsolutions.com
- Histology image: 08011loa – Histology Learning System at Boston University
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Anatomy of the globe of the eye
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| Fibrous tunic (outer) |
| Sclera |
- Episcleral layer
- Schlemm's canal
- Trabecular meshwork
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| Cornea |
- Limbus
- layers
- Epithelium
- Bowman's
- Stroma
- Dua's layer
- Descemet's
- Endothelium
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| Uvea/vascular tunic (middle) |
| Choroid |
- Capillary lamina of choroid
- Bruch's membrane
- Sattler's layer
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| Ciliary body |
- Ciliary processes
- Ciliary muscle
- Pars plicata
- Pars plana
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| Iris |
- Stroma
- Pupil
- Iris dilator muscle
- Iris sphincter muscle
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| Retina (inner) |
| Layers |
- Inner limiting membrane
- Nerve fiber layer
- Ganglion cell layer
- Inner plexiform layer
- Inner nuclear layer
- Outer plexiform layer
- Outer nuclear layer
- External limiting membrane
- Layer of rods and cones
- Retinal pigment epithelium
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| Cells |
- Photoreceptor cells (Cone cell, Rod cell) → (Horizontal cell) → Bipolar cell → (Amacrine cell) → Retina ganglion cell (Midget cell, Parasol cell, Bistratified cell, Giant retina ganglion cells, Photosensitive ganglion cell) → Diencephalon: P cell, M cell, K cell, Muller glia
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| Other |
- Macula
- Perifoveal area
- Parafoveal area
- Fovea
- Foveal avascular zone
- Foveola
- Optic disc
- Ora serrata
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| Anatomical regions of the eye |
| Anterior segment |
- Adnexa
- Fibrous tunic
- Anterior chamber
- Aqueous humour
- Iris
- Posterior chamber
- Ciliary body
- Lens
- Capsule of lens
- Zonule of Zinn
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| Posterior segment |
- Vitreous chamber
- Retina
- Choroid
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| Other |
- Keratocytes
- Ocular immune system
- Tapetum lucidum
- Eye care professional
- Eye disease
- Refractive error
- Accommodation
- Physiological Optics
- Visual perception
|
UpToDate Contents
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Related Links
- The zonula originates by a small number of delicate fibres from the vitreous [lamella]. 1980, Yves Le Grand, Sami G. El Hage, Physiological Optics, page 95, Nevertheless, the zonula is most often considered as the principal agent ...
- zonula (ˈzəʊnjʊlə) n (Anatomy) a variant of zonule Thesaurus Antonyms Related Words Synonyms Legend: Switch to new thesaurus Noun 1. zonula - small beltlike zone ... GLP-2 could recover and maintain the integrity of the ...
Related Pictures
★リンクテーブル★
[★]
接着帯
- 関
- adherens junction、adhesion belt
[★]
- 関
- interlamellar、interlaminar