3 8 



[Chap. XXXIX. 



a. 



CHAPTER XXXIX. 



THE RETINA. 



434. THE retina (Fig. 157) consists of the following 

 layers, counting from inwards towards the choroid mem- 

 brane: (!) The 

 membrana limitans 

 interna, which is 

 next to the mem- 

 brana hyaloidea of 

 the vitreous body ; 

 (2) the nerve-fibre 

 layer; (3) the layer 

 of ganglion cells; 

 (4) the inner gran- 

 ular or inner mole- 

 cular layer; (5) the 

 layer of inner 

 nuclei ; (6) the 

 outer granular, or 

 outer molecular, or 

 internuclear layer ; 

 (7) the layer of 

 outer nuclei ; (8) 

 the membrana 

 limitans externa ; 

 (9) the layer of 

 rods and cones ; 

 and (10) the pig- 

 mented epithelium 

 of the retina, or the tapetum nigrum mentioned above, 

 which forms, at the same time, the inner lining epithe< 

 lium of the choroid membrane, 



Fig. 157. From a 

 through the Eye of 

 Portion of Retina. 



--77Z. 



Transverse Section 

 Sheep ; Peripheral 



a, The inner part of the sclerotic 6, tbe supra- 

 choroidnl (pifymented) lamella? ; !, d, the layers 

 of the choroid coat : e, the pigmented epithe- 

 lium of tbe retina ; f. tbe layer of rods : g, the 

 cones ; ft, tbe layer of outer nuclei ; i, tbe outer 

 molecular layer; j, the layer of inner nuclei; 

 A:, the inner molecular layer ; 7, the layer of 

 panglion cells, with the radial or Miiller's 

 fibres between ; m, the layer of nerve-flbres. 

 (Atlas.) 



