OH. LV.] 



THE CORNEA. 



743 



It is separated from the choroid by a lymphatic space (peri- 

 choroidal), and this is in connection with smaller spaces lined 

 with endothelium in the sclerotic coat itself. There is a 



fig. 561. Horizontal preparation of cornea of frog; showing the network of branched 

 cornea-corpuscles. The ground substance is completely colourless, x 400. (Klein.) 



lymphatic space also outside the sclerotic separating it from a 

 loose investment of connective tissue, containing some smooth 

 muscular fibres, called the capsule of Tenon. The innermost layer 



Fig. 562. Surface view of part of lamella of kitten's cornea, prepared first with caustic 

 potash and then with nitrate of nil ver. ( By thLs method the branched cornea-corpuscle* 

 with their granular protoplasm and large oval nuclei are brought out. ) x 450. (Klein 

 and Noble Smith.) 



of the sclerotic is made up of loose connective tissue and pigment- 

 cells, and is called the lamina fusca. ,,,V 



Structure of the Cornea. The cornea is a transparent membrane 

 which forms a segment of a smaller sphere than the rest of the 

 eyeball, and is let in, as it were, into the sclerotic, with which it is 



