THE EYE. 



415 



Cornea/ 



epithelium. 

 A nterior elas- 

 tic membrane. 



nective-tissue fibers closely felted together. The 

 tendons of the ocular muscles are continuous with 

 the scleral fibers. The external scleral surface is 

 clothed with a layer of flattened endothelial cells 

 which belong to the capsule of Tenon. The latter is 

 a loose connective-tissue fabric that invests the eye- 

 ball, and is so intimately connected with the eye 

 muscles that coordinate 

 movement of the arti- 

 ficial eye, or glass shell, 

 is made possible after 

 the enucleation of an 

 eye. Pigmentation is 

 regularly present at the 

 corneal margin and the 

 surface next to the 

 choroid. This inner 

 pigmented scleral sur- 

 face is lined by a layer 

 of flattened endothelial 

 cells, forming a sepa- 

 rate membrane and 

 called by some the lam- 

 ina fusca; generally, Fig. 287. Section of the cornea of the 



however, it is regarded 

 as the outermost layer 



of the choroid and known as the lamina choroidea. 

 2. The Cornea. The cornea is inserted into the 

 sclerocorneal junction in which is found an annular 

 venous sinus, the canal of Schlemm, which may ap- 

 pear as a single canal or as several canals. The 

 cornea is a perfectly transparent medium and free 



Substantia 

 propria. 



Posterior elas- 

 tic membrane. 

 Endothelium. 



