Chap. XXXIX.] 



THE RETINA. 



309 



435. From this arrangement is excepted (a) the 

 papilla nervi optici, (6) the macula lutea and fovea 

 centralis retinae, and (c) the ora serrata of the retina. 



(a) The papilla nervi optici, or the blind spot of 



Fig. 158. Diagram of the Ner- Fig. 159. Diagram of the Connective 

 vons Elements of the Retina. Tissue Substance of the same. 



2, Nerve.flbres ; 3, ganglion cells; 4, inner molecular layer ; 5, inner nuclear 



layer; 6, outer molecular layer; 7, outer nuclear layer: 8, the membrana 



limitans externa ; 9, the rods and cones. (Max Schultze.) 



the retina, represents the entrance of the optic nerve- 

 fibres into the retina; thence, as from a centre, 

 they spread out in a radiating direction into the 

 saucer-shaped retina, of which they form the internal 



