Stroma of cornea
（重定向自Substantia propria）
![](/Images/godic/202502/13/Gray8714531.png")
![1:posterior segment 2:ora serrata 3:ciliary muscle 4:ciliary zonules 5:Schlemm's canal 6:pupil 7:anterior chamber 8:cornea 9:iris 10:lens cortex 11:lens nucleus 12:ciliary process 13:conjunctiva 14:inferior oblique muscule 15:inferior rectus muscule 16:medial rectus muscle 17:retinal arteries and veins 18:optic disc 19:dura mater 20:central retinal artery 21:central retinal vein 22:optic nerve 23:vorticose vein 24:bulbar sheath 25:macula 26:fovea 27:sclera 28:choroid 29:superior rectus muscle 30:retina](/Images/godic/202502/13/Eye-diagram_no_circles_border.svg4531.png")
The substantia propria (or stroma of cornea) is fibrous, tough, unyielding, and perfectly transparent.
It is composed of about 200 flattened lamellæ (plates of collagen fibrils), superimposed one on another. They are each about 1.5-2.5 micrometres in thickness. These fibrils run at different angles between the limbi. Fibres of the layers frequently interweave, the anterior lamellæ interweaving more than posterior lamellæ. The fibres of each lamella are parallel with one another, but at right angles to those of adjacent lamellæ. The lamellæ are produced by keratocytes (corneal corpuscles), which occupy about 10% of the substantia propria.