ORGANS OF THE SENSES AND THE COMMON INTEGUMENT 



Pigmented Mesodermal 



layer of part of Rudiment 



Upper eyelid retina vitreous body of sclera 



Mesoderm Ectodermal Nervous layer 



part of of retina 



vitreous body 

 FIG. 867. Sagittal section of eye of human embryo of six weeks. (Kollmann.) 



Lens 



Blood-vessel 



Primitive 



vitreous 



body 



-: 



'*$ 



Retina 



Outer layer of 

 optic cup 



FIG. 868. Section of developing eye of trout. (Szily.) 



