I-choroid iyinhlayiya ye-vascular yeso elilele phakathi kwe- retina ne-sclera. I-choroid iyinkimbinkimbi ngemuva kweso cishe cishe ngu-0.2 mm futhi ilula kancane kufika ku-0.1 mm endaweni yengxenye yeso. Iqukethe amangqamuzana e-epithelial enamabala abuyele emzimbeni futhi inikeza oksijeni nokondla ku-retina yangaphandle. I-choroid iyakha umzila ohlanganisa iris iris kanye ne-ciliary body.
I-choroid yenziwe ngezigaba ezine ezihlukene:
- Uhlaka lukaHolerer (ungqimba olukhulu lwesitja segazi)
- Isendlalelo sikaSattler (imikhumbi yegazi lesisindo esiphakathi)
- I-Choriocapillaris (i-capillaries)
- Isikhwama sikaBruch. (i-membrane engaphakathi kwe-choroid.)
I-melanin colorful pigment in the choroid ithatha ukukhanyisa nemingcele engqondweni ngaphakathi kweso elingase linciphise umbono. I-melanin nayo icatshangwa ukuthi ivikela imithwalo yegazi echosayo ngokumelene nobuthi obugqamile. I-pigment ye-choroidal yiyona ebangela "amehlo abomvu" lapho kuthathwa izithombe ezikhanyayo.
Obeye aziwe njengo: i-choroidea; i-coat coat
Ngaphandle kokuhlinzeka ngokukhululeka kwe-oksijini negazi ku-retina, ukugeleza kwegazi okugcoba nakho kunganciphisa futhi kufudumise i-retina. I-choroid nayo inezinqamuzana ezifihla izinto ezicatshangelwa ukuthi zihileleke ekukhuleni kwe-sclera. I-choroid ingashintsha ubukhulu futhi lezi zinguquko zingathuthukisa i-retina phambili nangemuva, zilethe ama-photoreceptors endizeni yokugxila.
Lokhu akukhiqizi okuningi kokugxila kodwa kubaluleke kakhulu ekukhuleni kweso lapho ingane ikhula.
Amehlo akho nombono omuhle uthembele ekunikezeni igazi okwanele ukusebenza. Ngakho-ke, i-choroid kumele ihlale inempilo ngangokunokwenzeka ngezikhathi zonke. Uma indawo yeso elihilela i-choroid isifo nganoma yikuphi, i-macula ne-optic nerve ingase ihlupheke.
Lapho i-macula ne-optic ye-optic ihlehliswa noma ingathinteki kabi, umphumela uvame ukwehla kakhulu embonweni futhi ngezinye izikhathi ngisho nobuphofu obuphelele. Ngaphezu kwalokho, ezinye izifo eziningi ezinzima zingenzeka ngenxa yesifo.
Izifo nokuphazamiseka kwe-Choroid
- Inqola ye-choroidal ene-hemorrhagic iyisimiso sokushisa emkhathini ngaphezu kwe-choroid noma e-choroid ebangelwa ukuqhuma kwemikhumbi ye-choroidal. Nakuba kungenzeka ngokuzenzekelayo, kuyinto engavamile kakhulu. Ngokuvamile kubangelwa ukuhlukunyezwa kweso ngesikhathi sokuhlinzwa kweso. Inqola yama-choroidal enegazi elimangalisayo ingaveza izimpawu ezijulile. Ukwelashwa kunamaconsi e-steroid e-topical, ama- cycloplegic iso wehla, nokucindezela kwamehlo kwehlisa amahla.
- Ukuqhekeka kwama -choroid kuyinto ikhefu eliphelele kwi-choroid, i-membrane ye-Bruch kanye ne-retinal pigment epithelium eyenzeka ngenxa yokuhlukunyezwa kwamehlo okufana nokushaya ngesibindi. Ngeshwa, ukuhlukana okuningi kwama-choroidal kuhilela phakathi kwe-retina, okuthiwa i-macula. I-macula ivumela ukuthi sibe nekhwalithi ephakeme, umbono ophakathi. Ukulimala kuholela ekulahlekelweni kwama-photoreceptors ku-macula nokulahlekelwa kombono ophakathi. Uma ukuphuka kungekho ku-macula, umbono wesisekelo ugcinwa.
- I-nevi ye-Choroidal iqoqo lamaseli aqoshiwe noma angenayo i-choroid, i-layer encane ngaphansi kwe-retina. Iningi lama-nevi elihle kakhulu lidinga ukuhlolwa kuphela. Udokotela wakho wezithombe uzothola isithombe sokukhathazeka futhi uhlole njalo. Abaningi abadingi ukwelashwa. Uma i- nevus ye-choroidal ine-pigmentation e-orange, ibonakala iphakanyisiwe, noma inesimo esingavamile, kungenzeka ukuthi ingaba i-melanoma engcolile engcolile. Kulesi simo, ukwelashwa okunonya kuyadingeka.
Ama-dystrophies ama-choroidal ayingxenye yezifo ezizuzwe njengefa ezichaphazela i -choroid. I-choroideremia, i-Gyrate atrophy, i-dystrophy yase-Central isolar ye-dystrophy, i-atrophy e-choroidal edijithali ne-Pigmented ene-retinochoroidal atrophy yizibonelo zama-dystrophies ama-choroidal. Ukulahlekelwa kombono okujulile kungenzeka kwezinye zala ma-dystrophies.
I-Chorioretinitis yisifo esivame kakhulu esihlasela i-choroidea. Lolu hlobo lokuvuvukala luvame ukuveza izindawo ezimnyama ezizungezile nombono ongenayo. Izingane ezincane kanye nalabo bantu abalwa ne-Herpes Simplex Virus ngokuvamile bathinteka yilesi sifo. Ama-antibiotics kanye nama-corticosteroids ngokuvamile asetshenziselwa ukulwa ngempumelelo ne-chorioretinitis.