Transparencyofcorneaisdueto:@cornealepitheliumisevenness.@withoutpigment cells.③avascular@the corneal epitheliumand endotheliumarecapable oftransportingsodium ions,chlorideionsand water,maintainingthecornealstromain a relatively hydrated state.regular orientationoftheverythin collagenfibrils of the stroma.6
Transparency of cornea is due to: ①corneal epithelium is evenness. ②without pigment cells. ③avascular ④the corneal epithelium and endothelium are 6 capable of transporting sodium ions, chloride ions and water, maintaining the corneal stroma in a relatively hydrated state. ⑤regular orientation of the very thin collagen fibrils of the stroma
b. Sclera: D.c.T·rich in collagen f., elastic f.fibroblasts34:lamina cribrosa·Function
7 b. Sclera : D.C.T • rich in collagen f., elastic f., fibroblasts • lamina cribrosa • Function
C.Corneal limbus:an area of transitionfromthecornea to the sclera. highly vascularized.Schlemm's canal/scleral venous sinus:drainstheaqueoushumorScleral spur: ciliary muscles attached8
8 c. Corneal limbus: an area of transition from the cornea to the sclera. highly vascularized. Schlemm’s canal/scleral venous sinus : drains the aqueous humor Scleral spur: ciliary muscles attached
PupilIris2.Vascularlayer:L.C.T, rich in b.v. &Sclerapigments.a.Iris: pupilanteriorchamber &IrisCLOSED ANGLEposteriorSchlemm'scanalchamberEpiscleralveinAqueous veinIridocornealTrabecularmeshworkangleb.Ciliary bodyc. Choroid:CiliarybodyAqueousflow
2. Vascular layer: L.C.T, rich in b.v. & pigments. a.Iris: pupil anterior chamber & 9 posterior chamber Iridocorneal angle b. Ciliary body: c. Choroid:
*Anteriorborderfurrows of irislayer:fibroblasts &melanocytes* Iris stroma: L.C.T.steliate fibroblasts& rich in b.v. &stellate melanocytespigments*Irisepithelium:anteriorlimitinglayeranteriorlayer:dilatorpupillaemargn ofbloodvesselPuplmusclesphincterpupillaestromamusclesphincter muscle80oolpupifposteriorlayer:S店dilatormusclepigmentedpigment-ladenmacrophageepitheliumfibrobiastposterior epitheluma10
* Anterior border layer: fibroblasts & melanocytes * Iris stroma: L.C.T. & rich in b.v. & pigments * Iris epithelium: anterior layer: dilator pupillae 10 muscle sphincter pupillae muscle posterior layer: pigmented epithelium