THE EYE. 



253 



externally (towards the choroid), commencing with a triangu- 

 lar expansion, and then diminishing into a connective-tissue 

 radial fibre system (e), which is wanting only in the macula 

 lutea. 



'Wt 



Fig. 203. — Diagramatic representation of the retina ; A, connective-tissue frame-work : a, mern- 

 brana limitans externa ; c, radial or Muellerian supporting fibres with their nuclei, e' ; d, frame- 

 work substance of the intergranular, and g, of the molecular layer ; /, membrana limitans in- 

 terna ; B, nervous elements ; 6, rods with outer and inner members ; c, cones with outer member 

 and body ; i\ rod, and c\ cone granule ; rf, expansion of the cone fibre into the finest fibrillae in 

 the intergranular layer ; f, granules of the inner granular layer ; g, confused mass of finest fibres in 

 the molecular layer ; h, ganglion cells ; k\ their axis-cylinder processes ; i, layer of nerve fibres. 



These are the Mueller's supporting fibres (e). They in- 

 ciease more and more towards the anterior terminal portion. 



