Iris. Iimpawu ze isakhiwo yiso

Iris na inxalenye Icipande le choroid. It is a licandelo obhityileyo kakhulu peripheral ngayo. Yena ciliary emzimbeni (ciliary) kunye choroid   na iindawana ezintathu ezingundoqo phecana semithambo, kwasekwa kwisithuba seenyanga ezine ukuya kwezisibhozo Palsy.

Iris ke abunjwe malunga kwiveki elinesixhenxe kuloo ndawo apho elunxwemeni indebe kuthiwa-optic i "superposition" le mesoderm. Yi ngenyanga yesihlanu sphincter iris luqokelelane - umsipha onoxanduva ukuhla ubukhulu umfundi. A dilator kamva ncinane. Le yi umsipha lwangaphakathi kamva iya kubonelela ukwandiswa. Ngenxa yoko kukho intsebenziswano entle kwaye elicacileyo kusini na phakathi uvalo sphincter kunye dilator iris owenza umsebenzi ngempumelelo ilawula ukugeleza msebe ukukhanya. Yi ngenyanga yesithandathu abunjwe ngokupheleleyo diff pigmentary inyama epithelial. Oku iqukumbela ukuyilwa iinkqubo zolawulo ezisisiseko le nkqubo.

contact ngoko nangoko ngqo kunye inwebu iris iso yabantu ayinayo. Phakathi kwayo kunye udonga olungaphandle eshiya indawo encinane - egumbini ngaphambili nto leyo izaliswe zolwelo (igumbi) ngamanzi.

iris okupheleleyo na uhlobo ipleyiti ngeenxa enobubanzi emalunga elinambini eemilimitha kunye obungama malunga namashumi amathathu anesibhozo iimilimitha. Xa iziko yayo indawo setyhula apho ukukhanya ingena - umfundi. Yaba nguye sebenzisa ukulawula isixa semitha lingene emehlweni. ubukhulu umfundi kuxhomekeke iqondo yokukhanyisa. Le umqadi ngeenxa zonke ezincinane, kokukhona kuya kuba ubukhulu balo. avareji ukubaluleka kwalo ezintathu iimilimitha. Ngelo xesha abantu abaselula umfundi ubukhulu idla lilikhulu kancinci nje abalupheleyo. Oku kuchazwe yi kukuba ekuhambeni kwexesha kukho yoma le dilator kunye sphincter abanesigulo.

Iimpawu eziphambili kwamehlo element njengoko iris, ngokwebala, umzekelo, imo umfundi beso kunye nendawo xa kuthelekiswa nezinye izakhiwo iso. Bonke bephela zibangelwa ngeempawu ezithile yokwakheka yesakhiwo yayo.

Umaleko phambi iye radiarnoy iris striation, leyo ulunika uhlobo isiqabu yeebhutsi. Nzulu le lisikwe-uhlobo, ibekwe izihlunu yayo nokuqina, ebizwa lacunae. Liyancipha enye enesiqingatha ezinga- pupillary enxuseneyo buthelezi, bryzhzhi ibekwe (pinion). Njengokuvuyelela kwabo ekwabeni kwabo iris yangamacandelo amabini: engaphandle (ciliary) kunye zangaphakathi - pupillary. vee concentric zichazwe kwindawo yokuqala. Basimisela isiphumo ngqo zokunciphisa nokolula iris ngexesha kwayo.

choroid diff phambi ezahlulwe dilator emelwe sombala yayo kwaye izaleko umda. Okokuqala kumngcipheko pupillary yakha undi okanye limsi. Front Front iris luyinto stroma iris langaphandle umda umaleko.