AND THE COMMON Ii 



'UMENT 





The Iris. The iris has received its name from its various colors in different 

 individuals. It is a thin, circular, contractile disk, suspended in the aqueous 

 humor between the cornea and lens, and perforated a little to the nasal side of its 

 center by a circular aperture, the pupil. By its periphery it is continuous with, 

 the ciliary body, and is also connected with the posterior elastic lamina of the 



FIG. 877. Diagram of the bloodvessels of the eye, as seen in a horizontal section. (Leber, after Stohr.) 



Course of vasa centralia retinse: a. Arteria. a. 1 Vena centralis retinae. B. Anastomosis with vessels of outer coats. 

 C. Anastomosis with branches of short posterior ciliary art trits. D. Anastcn csis with chorioideal vessels. 



Course of vasa ciliar. postic. brev. : I. Arteriae, and Ii. Vense ciliar. postic. brev. II. Episcleral artery. Hi. Episcleral 

 vein. III. Capillaries of lamina choriocapillaris. 



Course of vasa ciliar. postic. long.: 1. a. ciliar. post, longa. 2. Circulus iridis major cut across. 3. Branches to ciliary 

 body. 4. Branches to iris. 



_ Course of vasa ciliar. ant.: a. Arteria. a\. Vena ciliar. ant. h. Junction with the circulus iridis major, c. Junction 

 with lamina choriocapill. d. Arterial, and d\. Venous episcleral branches, e. Arterial, and a. Venous branches to 

 conjunctiva sclerse. /. Arterial, and/i. Venous branches to corneal border. V. Vena vorticosa. <S. Transverse section 

 of sinus venosus sclerte. 



cornea by means of the pectinate ligament; its surfaces are flattened, and look 

 forward and backward, the anterior toward the cornea, the posterior toward the 

 ciliary processes and lens. The iris divides the space between the lens and the 

 cornea into an anterior and a posterior chamber. The anterior chamber of the eye 

 is bounded in front by the posterior surface of the cornea; behind by the front of 

 the iris and the central part of the lens. The posterior chamber is a narrow chink 



