ANATOMY OF THE EYE 



15 



the connective tissue about the central vessels. This 

 portion is known as the lamina cribrosa. The deep lay- 

 ers of the sclera contain numerous pigment-cells, more 

 pronounced in animals than in man, hence the brown- 

 ish or bluish color. It is penetrated by numerous cihary 



Anterior 

 chamber 



Rectus oculi inferior 



Ciliary 

 processes 



Chorioid 



Y{g, 3.— Vertical section of eyeball of horse, about f . The contour of the 



crystalline lens is dotted. (Sisson, Veterinary Anatomy.) 



vessels at the posterior portion surrounding the optic 

 nerve entrance. The anterior portion is connected to 

 the conjunctiva by a loose connective tissue, known 

 as the episcleral tissue. 



The chorioid, or middle coat, is a vascular and pig- 



