MICROSCOPIC ANATOMY OF TIIK ORGANS. 



(5) The corneal endothelium (posterior epithelial lavrr) 

 consists of a layer of low hexagonal cells, whose protoplasm 

 is rich in fibrils. These seem to pass from one cell to another, 

 as in the stratum spinosum of the epidermis. 



The sclera has a structure similar to that of the substantia 

 propria corner. It possesses, however, numerous elastic fibres, 

 of which a part form networks. The flat connective-tissue 

 cells lie in irregularly branched spaces. The connective- tissue 

 fibrils are arranged in layers in such a way that those of one 

 layer have a meridional and those of another an equatorial 



FIG. 260. 



Lymph canaliculi 



Corneal cell in 

 lymph space 



From a horizontal section of an ox's cornea. Positive picture of the canal system 

 demonstrated by the gold chloride method. 4~,0. 



direction. The sclera shows in certain places collections of 

 pigment (e. g.. at the border of the cornea, and in the neigh- 

 borhood of the entrance of the optic nerve). 



On the inner surface of the sclera we find a loose connective 

 tissue arranged in thin layers. This contains branched pig- 

 ment cells and joins the sclera to the chorioidea. In sep- 

 arating these layers a part of the connective tissue remains 

 with the sclera, and a part adheres to the chorioidea. We dis- 

 tinguish this connective-tissue layer as the lamina fusca slerce 

 or lamina euprachorioidea. At the place where the optic nerve 

 penetrates the sclera we find only a remnant of the layer in the 



