The capillary lamina of choroid or choriocapillaris[1] is a part of the choroid of the eye.[2] It is a layer of capillaries immediately adjacent to Bruch's membrane of the choroid.[1] The choriocapillaris consists of a dense network of freely anastomosing highly permeable fenestrated large-calibre capillaries. It nourishes the outer avascular layers of the retina.[2]
In the capillaries that compose the choriocapillaris, the fenestrations are densest at the aspect of the capillaries that faces retina, whereas pericytes are situated at the obverse aspect.[3]
The choroidal blood vessels can be divided into two categories: the choriocapillaris, and the larger caliber arteries and veins that lie just posterior to the choriocapillaris (these can easily be seen in an albino fundus because there is minimal pigment obscuring the vessels).[4] The choriocapillaris forms a single layer of anastomosing, fenestrated capillaries having wide lumina with most of the fenestrations facing toward the retina. The lumen is approximately three to four times that of ordinary capillaries, such that two or three red blood cells can pass through the capillary abreast, whereas in ordinary capillaries the cells usually course single file. The cell membrane is reduced to a single layer at the fenestrations, facilitating the movement of material through the vessel walls. Occasional (pericyte)s (Rouget cells), which may have a contractile function, are found around the capillary wall. Pericytes have the ability to alter local blood flow. The choriocapillaris is densest in the macular area, where it is the sole blood supply for a small region of the retina. The choriocapillaris is unique to the choroid and does not continue into the ciliary body.[5]
Functionedit
The choriocapillaris serves multiple functions that include sustaining the photoreceptors, filtering waste produced in the outer retina and regulating the temperature of macula.[6][7]
The capillary wall is permeable to plasma proteins which is probably of great importance for the supply of vitamin A to the pigment epithelium.[8]
Historyedit
The choriocapillaris was first described in man by Hovius in 1702, although it was not so named until 1838, by Eschricht. Passera (1896) described its form as star-shaped, radiating capillaries beneath the pigment epithelium of the retina, and Duke-Elder and Wybar (1961) have emphasized its nature as a network of capillaries in one plane.[1]
Referencesedit
^ abcImranBhutto,GerardLutty (1967-09-01). "CHORIOCAPILLARIS AND LAMINA ELASTICA (VITREA) OF THE RAT EYE" (PDF). British Journal of Ophthalmology.
^ abStandring, Susan (2020). Gray's Anatomy: The Anatomical Basis of Clinical Practice (42th ed.). New York. pp. 794–795. ISBN978-0-7020-7707-4. OCLC 1201341621.{{cite book}}: CS1 maint: location missing publisher (link)
^Standring, Susan (2020). Gray's Anatomy: The Anatomical Basis of Clinical Practice (42th ed.). New York. pp. 794–795. ISBN978-0-7020-7707-4. OCLC 1201341621.{{cite book}}: CS1 maint: location missing publisher (link)
^Al Lens, Sheila Coyne Nemeth, janice K Ledford, Ocular Anatomy and Physiology (2008). the posterior segment (2 ed.). SLACK. p. 87.{{cite book}}: CS1 maint: multiple names: authors list (link)
^Lee Ann Remington, CLINICAL ANATOMY AND PHYSIOLOGY OF THE VISUAL SYSTEM (2012). Chapter3 Uvea (3 ed.). Elsevier. p. 53.
^M. A. Zouache, I. Eames, C. A. Klettner, and P. J. Luthert (2016-10-25). "Form, shape and function: segmented blood flow in the choriocapillaris". Scientific Reports. 6: 35754. Bibcode:2016NatSR...635754Z. doi:10.1038/srep35754. PMC5078844. PMID 27779198.{{cite journal}}: CS1 maint: multiple names: authors list (link)
^Bill A, Sperber G, Ujiie K. (1983-02-06). "Physiology of the choroidal vascular bed". International Ophthalmology. 6 (2): 101–7. doi:10.1007/BF00127638. PMID 6403480. S2CID 499637.{{cite journal}}: CS1 maint: multiple names: authors list (link)
capillary, lamina, choroid, this, scientific, article, needs, additional, citations, secondary, tertiary, sourcessuch, review, articles, monographs, textbooks, please, also, establish, relevance, primary, research, articles, cited, unsourced, poorly, sourced, . This scientific article needs additional citations to secondary or tertiary sourcessuch as review articles monographs or textbooks Please also establish the relevance for any primary research articles cited Unsourced or poorly sourced material may be challenged and removed April 2015 Learn how and when to remove this template message The capillary lamina of choroid or choriocapillaris 1 is a part of the choroid of the eye 2 It is a layer of capillaries immediately adjacent to Bruch s membrane of the choroid 1 The choriocapillaris consists of a dense network of freely anastomosing highly permeable fenestrated large calibre capillaries It nourishes the outer avascular layers of the retina 2 Capillary lamina of choroidDetailsIdentifiersLatinLamina chorioidocapillarisTA98A15 2 03 006FMA58437Anatomical terminology edit on Wikidata Contents 1 Structure 1 1 Microstructure 2 Function 3 History 4 References 5 External linksStructure editMicrostructure edit In the capillaries that compose the choriocapillaris the fenestrations are densest at the aspect of the capillaries that faces retina whereas pericytes are situated at the obverse aspect 3 The choroidal blood vessels can be divided into two categories the choriocapillaris and the larger caliber arteries and veins that lie just posterior to the choriocapillaris these can easily be seen in an albino fundus because there is minimal pigment obscuring the vessels 4 The choriocapillaris forms a single layer of anastomosing fenestrated capillaries having wide lumina with most of the fenestrations facing toward the retina The lumen is approximately three to four times that of ordinary capillaries such that two or three red blood cells can pass through the capillary abreast whereas in ordinary capillaries the cells usually course single file The cell membrane is reduced to a single layer at the fenestrations facilitating the movement of material through the vessel walls Occasional pericyte s Rouget cells which may have a contractile function are found around the capillary wall Pericytes have the ability to alter local blood flow The choriocapillaris is densest in the macular area where it is the sole blood supply for a small region of the retina The choriocapillaris is unique to the choroid and does not continue into the ciliary body 5 Function editThe choriocapillaris serves multiple functions that include sustaining the photoreceptors filtering waste produced in the outer retina and regulating the temperature of macula 6 7 The capillary wall is permeable to plasma proteins which is probably of great importance for the supply of vitamin A to the pigment epithelium 8 History editThe choriocapillaris was first described in man by Hovius in 1702 although it was not so named until 1838 by Eschricht Passera 1896 described its form as star shaped radiating capillaries beneath the pigment epithelium of the retina and Duke Elder and Wybar 1961 have emphasized its nature as a network of capillaries in one plane 1 References edit a b c ImranBhutto GerardLutty 1967 09 01 CHORIOCAPILLARIS AND LAMINA ELASTICA VITREA OF THE RAT EYE PDF British Journal of Ophthalmology a b Standring Susan 2020 Gray s Anatomy The Anatomical Basis of Clinical Practice 42th ed New York pp 794 795 ISBN 978 0 7020 7707 4 OCLC 1201341621 a href Template Cite book html title Template Cite book cite book a CS1 maint location missing publisher link Standring Susan 2020 Gray s Anatomy The Anatomical Basis of Clinical Practice 42th ed New York pp 794 795 ISBN 978 0 7020 7707 4 OCLC 1201341621 a href Template Cite book html title Template Cite book cite book a CS1 maint location missing publisher link Al Lens Sheila Coyne Nemeth janice K Ledford Ocular Anatomy and Physiology 2008 the posterior segment 2 ed SLACK p 87 a href Template Cite book html title Template Cite book cite book a CS1 maint multiple names authors list link Lee Ann Remington CLINICAL ANATOMY AND PHYSIOLOGY OF THE VISUAL SYSTEM 2012 Chapter3 Uvea 3 ed Elsevier p 53 Parver LM 1991 03 01 Temperature modulating action of choroidal blood flow Eye 5 2 181 5 doi 10 1038 eye 1991 32 PMID 2070878 M A Zouache I Eames C A Klettner and P J Luthert 2016 10 25 Form shape and function segmented blood flow in the choriocapillaris Scientific Reports 6 35754 Bibcode 2016NatSR 635754Z doi 10 1038 srep35754 PMC 5078844 PMID 27779198 a href Template Cite journal html title Template Cite journal cite journal a CS1 maint multiple names authors list link Bill A Sperber G Ujiie K 1983 02 06 Physiology of the choroidal vascular bed International Ophthalmology 6 2 101 7 doi 10 1007 BF00127638 PMID 6403480 S2CID 499637 a href Template Cite journal html title Template Cite journal cite journal a CS1 maint multiple names authors list link External links edithttps web archive org web 20070927210324 http www trinity edu rblyston MicroA Lectures L31 html sld015 htm nbsp This cardiovascular system article is a stub You can help Wikipedia by expanding it vte nbsp This article about the eye is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Capillary lamina of choroid amp oldid 1176191990, wikipedia, wiki, book, books, library,
