422 NORMAL HISTOLOGY AND ORGANOGRAPHY. 



(i) The internal limiting membrane is a very deli- 

 cate homogeneous layer formed by lateral expansions 

 of processes of neuroglia elements. It is closely ap- 

 plied to (2) the optic nerve fibers. The latter are non- 

 medullated and radiate toward the entrance of the op- 

 tic nerve, composed of both centrifugal and centrip- 

 etal axones. The latter arise from (3) the ganglionic 

 cells, that are irregularly distributed along the inner 



r/S> 4Urf '@a '9'4*&av<Bk &'&. 



, Internal limiting membrane. 

 Layer of nerve fibers. 

 Ganglion cell layer. 



Inner molecular layer. 



Inner nuclear layer. 

 Outer molecular layer. 



Outer nuclear layer. 



External limiting membrane. 

 .- Rods and cones. 



Pigment layer. 



Fig. 291. Section of retina of the eye. 



border of the retina. These cells are large, multi- 

 polar, and their dendrites extend outward and con- 

 tribute to the substance of (4) the inner molecular 

 layer. The latter is a network of neuroglia fibrils 

 and nerve processes, contributed in part by the cells 

 of (5) the inner nuclear layer. This layer is com- 

 posed of several rows of nucleated cells of which some 

 are sustentacular, or neuroglia elements, some bi- 

 polar ganglion cells, and others multipolar ganglion 



