114 



' VETERINARY OPHTHALMOLOGY. 



nourishment to the lens. The zonule has control over 

 the accommodative changes of the lens. The tissue 

 proper of the lens is composed of concentric layers, and 

 each layer is composed in turn of a single layer of 



Fig. 60. 



Eye of calf— third month (Kblliker). pp, lower lid; pa, upper lid; m, 

 mesoderm not yet difEerentiated ; p, cornea ; mp, membrana papillaris ; 

 1, place of iris ; oho, chorio-capillaris ; g, vitreous ; p. pigment layer or 

 proximal lamella of the secondary eye vesical ; r, its distal lamella, 

 composing the retina, ' 



fibers with a cementing substance. These fibers have 

 each an oval nucleus. Now, each fiber runs from the an- 

 terior to the posterior surface in a meridianal manner, 

 the ends meeting at the poles of the lens in such a 

 manner as to form a star-like figure. Taking the lens 



