60 



STRUCTURE OF THE RETINA. [Boon in. 



FIG. 145. DIAGRAM TO ILLUSTRATE THE STRUCTURE OF THE RETINA. 



The figure is quite diagrammatic and is introduced simply to assist in the descrip- 

 tion of the probable structure of the retina. 



The several " layers " are indicated by the numeral I, &c. in order from within 

 (vitreous humour) outwards. 



On the right-hand side is shewn a fibre of Miiller reaching from the inner limiting 

 membrane m.l.i., formed by the coalescence of its feet, to the outer limiting 

 membrane nt.l.e. ; the lateral processes of the fibre are indicated, as well as 

 the neuroglial fibrils (possibly independent of the fibres of Muller), in III. the 



