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 



Internal limiting membrane. 

 Laytr of nerve fibers. 

 Ganglion cell layer. 



Inner molecular layer. 



Inner nuclear layer. 

 Outer molecular layer. 



Outer nuclear layer. 



External limiting membrane. 

 Rods and cones. 



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 



