毛様体小帯
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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/04/09 12:26:44」(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 |
| Latin |
zonula ciliaris |
| Identifiers |
| Gray's |
p.1018 |
Dorlands
/Elsevier |
z_01/12870397 |
| TA |
A15.2.05.015 |
| FMA |
58838 |
| Anatomical terminology |
The zonule of Zinn (Zinn's membrane, ciliary zonule) (after Johann Gottfried Zinn) is a ring of fibrous strands connecting the ciliary body with the crystalline lens of the eye. These fibers are sometimes collectively referred to as the suspensory ligaments of the lens.
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 μ in diameter.[3]
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
- ^ a b c Kaufman, Paul L.; Alm, Albert (2010). Adler's physiology of the eye (11th ed. ed.). St. Louis, Mo: Mosby. pp. 145–146. ISBN 978-0-323-05714-1.
- ^ http://www.etsu.edu/cpah/hsci/forsman/WebVision.htm
- ^ a b Bornfeld, Norbert; Spitznas, Manfred; Breipohl, Winrich; Bijvank, Gerhard J. (1974). "Scanning electron microscopy of the zonule of Zinn". Albrecht von Graefes Archiv for Klinische und Experimentelle Ophthalmologie 192 (2): 117–129. doi:10.1007/BF00410698.
- ^ McCulloch, C (1954–1955). "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. Retrieved 15 December 2012.
- ^ Farnsworth, PN; Mauriello, JA; Burke-Gadomski, P; Kulyk, T; Cinotti, AA (January 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
- ciliary+zonule at eMedicine Dictionary
- Histology image: 08011loa — Histology Learning System at Boston University
This article incorporates text from a public domain edition of Gray's Anatomy.
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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
- 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
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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
- Foveola
- Fovea centralis
- Parafovea
- Perifovea
- Optic disc
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| Anterior segment |
- Anterior chamber
- Aqueous humour
- Posterior chamber
- Lens
- Capsule of lens
- Zonule of Zinn
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| Posterior segment |
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| Other |
- Asthenopia
- Keratocytes
- Ocular immune system
- Tapetum lucidum
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| Description |
- Anatomy
- Physiology
- Phenomena
- appearance
- visual
- optical illusions
- proteins
- Development
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| Disease |
- Congenital
- Corneal dystrophy
- Neoplasms and cancer
- Other
- Symptoms and signs
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| Treatment |
- Procedures
- Drugs
- infection
- glaucoma and miosis
- mydriatics
- vascular
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UpToDate Contents
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English Journal
- Comment on the publication "Three-dimensional ultrasound, biomicroscopy environmental and conventional scanning electron microscopy investigations of the human zonula ciliaris for numerical modelling of accommodation" by O. Stachs et al.
- Schachar RA, Abolmaali A, Kamangar F.
- Graefe's archive for clinical and experimental ophthalmology = Albrecht von Graefes Archiv für klinische und experimentelle Ophthalmologie.Graefes Arch Clin Exp Ophthalmol.2006 Aug;244(8):1062-3; author reply 1064-5. Epub 2006 Mar 8.
- PMID 16523304
- Three-dimensional ultrasound biomicroscopy, environmental and conventional scanning electron microscopy investigations of the human zonula ciliaris for numerical modelling of accommodation.
- Stachs O1, Martin H, Behrend D, Schmitz KP, Guthoff R.
- Graefe's archive for clinical and experimental ophthalmology = Albrecht von Graefes Archiv für klinische und experimentelle Ophthalmologie.Graefes Arch Clin Exp Ophthalmol.2006 Jul;244(7):836-44. Epub 2005 Oct 5.
- PURPOSE: Biomechanical modelling of the accommodation process is a useful tool for studying the mechanism of accommodation and presbyopia and can aid in the development of accommodative lens-replacing materials. Existing biomechanical models, however, use a very simplified zonula structure. The aim
- PMID 16205936
- [A distance ring for stabilization of the lens capsule (a multicenter clinical study)].
- Pitrová S1.
- Ceská a slovenská oftalmologie : casopis Ceské oftalmologické spolecnosti a Slovenské oftalmologické spolecnosti.Cesk Slov Oftalmol.1998;54(5):299-304.
- Cataract extraction in eyes with a loose suspension apparatus implies always an unconventional method of surgery. An important contribution towards the stabilization of the capsule during surgery and during the postoperative period is implantation of a polymethyl methacrylate (PMMA) ring into the ca
- PMID 9818481
Japanese Journal
- Three-dimensional ultrasound biomicroscopy, environmental and conventional scanning electron microscopy investigations of the human zonula ciliaris for numerical modeling of accommodation
Related Links
- cil·i·ar·y zon·ule [TA] a series of delicate meridional fibers arising from the inner surface of the orbiculus ciliaris that run in bundles between, and in a thin layer over, the ciliary processes; at the inner border of the corona, the fibers ...
- Zonula ciliaris, also known as the zonule of Zinn and simply the zonules, this is the part of the of the human eye formed by the change of structure of the hyaloid membrane in the area where it is anterior to the ora serrata - see ...
★リンクテーブル★
[★]
- 英
- apparatus suspensorius lentis, zonula ciliaris, ciliary zonule
- 関
- 毛様小帯