GENERAL STRUCTURE OF THE RETINA. 



219 



often remains adherent, in which case the layer of rods and 

 cones drawn out of their pigment sheaths constitutes the most 

 external layer of the retina. A part, however, even of these not 

 unfrequently remains behind with the pigment of the choroid, 



Fig. 344. 



Fig. 344. General view of the layers of the retina of Man. Mag- 

 nified 400 diameters. The numbers refer to the explanation given 

 in the text. 



so that in well-preserved specimens we find the pigment sheaths 

 do not easily permit the detachment of the enclosed portion 

 of the rods, the latter adhering with the pigment to the 

 choroid, whilst the inner portion of the rods cleaves to the retina. 



