440 ZONA CILIARIS. 



SO as to give it the beaded or puckered appearance. The lens 

 is seen inclosed in its capsule, over which the anterior layer of 

 the hyaloid is believed to pass. On the outer side is seen the 

 canal of Petit; and on the outer side of this again, the corona, 

 or zonula ciliaris of Camper and Zinn, stained by the pigment, 

 and in the folds of which are placed the ciliary processes. 

 The two bodies are thus, as it were, dove-tailed together, and 

 vessels, according to Dr. Knox, pass from the latter to the former. 

 Fig. 196.* — The zona, or corona ciliaris of 



---] Camper and Zinn, may be seen very 

 distinctly by removing the sclerotica, 

 choroid, iris, and retina, one or two 

 days after death, leaving the vitreous 

 humor entire, with the lens embedded 

 in its anterior part. We then per- 

 ceive a number of striae on the vitreous 

 humor, converging towards the lens, 

 as seen in fig. 196, corresponding in appearance with the cili- 

 ary bodies, and narrowed on the inner side exactly as the latter 

 is. These appearances have been noticed by most wa'iters, 

 merely as the marks left by the ciliary processes ; but I have 

 satisfied myself, by a careful microscopical examination of the 

 eyes of different animals, that it has a real existence, and con- 

 sists of folds of the vitreous humor, which commence behind 

 by a well defined margin and terminate in front, by being 

 attached to the capsule of the lens; the furrows between these 

 folds being capable of receiving the folds of the ciliary bodies. 

 By this means, these two bodies are firmly connected or dove- 

 tailed together, one of which (the choroid) has considerable 

 strength and firmness, and the other (the hyaloid tunic) is 

 extremely delicate in structure. By means of this connexion, 

 the tunic of the vitreous humor and the lens, through the 

 medium of the ciliary ligament, become attached at the place 

 of junction of the sclerotic coat and the iris, and without which, 

 the mechanical construction of the eye would have been imper- 

 fect. — * 



* Vide article Eye, in the Cyclopedia of Anatomy and Physiology, from 

 ■which many of these figures have been taken. 



