CILIARY REGION 



403 



The iris does not hang down perpendicularly into the 

 space between the front face of the crystalline lens and 

 the posterior surface of the cornea, which is filled by 

 the aqueous humour, but applies itself very closely to the 

 anterior face of the lens, so that hardly any interval is 

 left between the two (Figs. 126 and 131). 



The retina lines the interior of the eye, being placed 

 between the choroid and vitreous humour, its rods and 

 cones (see pages 415-419) being imbedded in the pigment 



Fio. 128. — View of Front H \'_; 



.EBALL SEEN FROM BEHIMD. 



a, circular fibres ; b, radiating fibres of the iris ; c, ciliary processes ; 

 d, choroid. The crystalline lens has been removed. 



epithelium lining the former, and its inner limiting 

 membrane touching the latter. 



About a third of the distance back from the front of the 

 eye the retina seems to end in a wavy border called the 

 ora serrata (Fig. 126, 9), and in reality the nervous ele- 

 ments of the retina do end here, having become consider- 

 ably reduced before this line is reached. Some of the 

 connective tissue elements however pass on as a delicate 

 kind of membrane at the back of the ciliary processes 

 towards the crystalline len& 



D D 2 



