optic nerve 



reliual 

 pigmer.l cells 



rods and cones- 



ganglionic layer 



o/i/iV nerve fibres 



Fig. 4. The axon-poles of the tilted over niK-lei in the 

 ganglionic layer are directed uniformly towards the point 

 of exit of the optic nerve fibres. Frog-embryo at the 21st day. 



