ORGANS OF SPECIAL SENSE. 



351 



3. The vesicular layer, composed of a layer of large, flask-shaped 

 ganglionic cells. It is wanting in the muscular region. 



4. The inner molecular layer is composed of a layer of glandular- 

 like structure, forming a reticulum inclosing minute granules. 



5. The inner nuclear layer is composed of three sets of nuclear 

 bodies, the first resembling bipolar nerve-cells, the second without 

 branches, and the third continuous with the radiating fibres, or fibres of 

 Miiller. 



6. The outer molecular layer resembles closely the inner molecular 

 layer, from which it differs only by containing branched stellate cells. 



FIG. 159. 



Diagram of the retinal vessels. 1, superior temporal artery; 2, 

 superior temporal vein; 3, superior nasal vein; 4, superior nasal ar- 

 tiry; 5, inferior nasal vein; 6, inferior nasal artery; 7, inferior tem- 

 poral vein; 8, inferior temporal artery; 9, macula lutea; 10, macular 

 veins. (Hull.) 



7. The outer nuclear lui/cr is composed of several layers of nuclear 

 cells, separable into two kinds, the rod vnuiulcx and cone unniitlrx, both 

 continuous with the rods and cones of Jacob's membrane. 



8. The niciiihrdii'i limituiix extcrna is, like the internal limiting 

 membrane, derived from the radiating fibres, or fibres of M filler. 



9. JucolSx membrane, or the layer of rods and cones, consists of 

 two distinct kinds of cells the rods and cones, distributed alternately 

 throughout this layer, the rods being much more numerous. 



The rods are solid, stand perpendicularly to the surface, and con- 

 sist of two portions an outer striated and an inner granular. 



