THE EYE 



383 



the former being continuous with the sclerotic. Here there is 

 a number of small apertures (lamina cribrosa) for the funiculi 

 of the optic nerve, and outside of these smaller foramina for 

 the passage of vessels. 



The cornea forms the anterior sixth of the external coat. 

 It is transparent and projecting, and nearly an arc of a true 

 sphere, the anterior surface being convex and the posterior 

 surface concave. 



FIG. 66 



The lacrymal apparatus. (Gray.) 



The choroid or intermediate coat is continued into the choroid, 

 prolonged into the iris anteriorly, and forming the ciliary 

 processes. 



It is a chocolate-colored vascular structure lying between 

 the sclerotic and retina and investing the posterior five-sixths 

 of the eyeball, blending in front with the iris after forming 

 a number of folds, the ciliary processes. Behind it is pierced 

 by the optic nerve. It is smooth internally, and is connected 

 to the lamina fusca of the sclerotic externally. 



The ciliary processes, seventy or more in number, consist 

 of a circle of folds or thickenings of the choroid received into 

 pits in the vitreous and suspensory ligament of the lens. They 



