290 



THE NERVOUS SYSTEM 



and centrally come into contact at the outer molecular layer 

 with the first order of neurones — bipolar cells, which in 



TTTT . 1 »l7m PIGMENTED EPITHELIUM 



receptor; \ / \ 



CELLS \ II \ 



FIRST 



RODS AND CONE5 



OUTER NUCLEAR. LAYER. 



> ii ■>*• 1^ A OUTER MOLECULAR LAYER. 



NEURPNE5*\ (m O "^^^"^ NUCLEAR LAYER 



SECOND 

 NEURONES 



11^ 0^. ^ INNER MOLECULAR U^YER 



' t" '" "" 



OPTIC NERVE FIBRES 



Fig. 48. — Diagram showing layers of retina. 



turn are connected at the inner molecular layer with the 



dendrites of the optic nerve. Internal to this comes a 



layer of optic nerve-cells, and then the optic nerve-fibres. 



Certain parts of the retina require special mention. 



