340 THE LYMPHATICS OF THE EYE, BY G. SCHWALBE. 



Fontana's canal, as far as to the posterior border of the ciliary 

 body, and lies in this between the ciliary muscle and the pars 

 'ciliaris retinae. In the eye of Man also fluids, when injected, 

 penetrate at this point for some distance into the ciliary body. 

 The trabeculse of the canal of Fontana in Mammals, as well as 

 the trabeculse of the ligamentum pectinatum of Man corre- 

 sponding to them, are everywhere invested by endothelial 

 sheaths exactly resembling those which cover the trabeculse of 

 the. sub vaginal space. 



The anterior chamber of the eye is lined throughout in front 

 by the epithelium of the membrane of Descemet ; behind, by 

 the epithelium of the anterior surface of the iris, .the two 

 being continuous with each other in the angle of the chamber 

 on the trabeculse of the ligamentum pectinatum, yet so that 

 fissures are here present, by means of which the plexiform 

 system of Fontana's canal communicates with the anterior 

 chamber of the eye. The 'latter discharges itself near the 

 border of the membrane of Descemet, through the canal of 

 Schlemm, into the vense ciliares anticse (15). This is shown 

 by the fact that on injecting a solution of Prussian blue into 

 the anterior chamber of the eye, these veins are always filled, 

 but the lymphatics never. This repletion of the veins by injec- 

 tion occurs in the fresh eye of the Pig with a pressure not 

 exceeding twenty millimeters of quicksilver, and demonstrates 

 that the injection must reach the veins in well beaten paths, 

 and that its entrance into the bloodvessels is not in any way 

 rendered possible by rupture of the tissues. Nor can the 

 intense blue injection of the veins be attributed to filtration, 

 since the blue injection fluid never filtrates, as such, through 

 vascular walls. 



In order to ascertain the mode in which the communication 

 of the anterior chamber of the eye in man with the veins is 

 effected, it is necessary to examine meridianal sections of such 

 eyes, made through the corpus ciliare, in which the veins have 

 been filled by an injection driven into the anterior chamber. 

 In such sections it may be observed that a short stria of 

 the blue injection fluid extends from the anterior chamber of 

 the eye just behind the margin of the membrane of Descemet, 

 obliquely backwards and outwards to the canal of Schlemm. 



