THE CILIARY PROCESSES. 



29 



On the inner surface of the tunica Ruyschiana is a structureless or finely 

 fibrillated transparent membrane, the membrane of Bruch (fig. 29, a), which 

 lies next to the pigmentary layer of the retina, and, especially anteriorly in 

 the region of the ciliary processes, presents on its outer surface numerous 

 microscopic reticulations. It tends to become thickened as age advances. 



The ciliary processes (corpus ciliare) have the same structure as the rest of 

 the choroid ; but the capillary plexus of the vessels is less fine, and has meshes 

 with chiefly a longitudinal direction ; and the ramified cells, fewer in number, are 

 devoid of pigment towards the free extremities of the folds. The ciliary processes 



tissue, of 

 sclerotic. 



\ 



insertion of canal oj 

 ciliary muscle. Schlemm. 



c<inal of 

 Schlemm. 



tissue of 

 cornea. 



I 



ciliary muscle. uveal pigment of iris. 



Fig. 36. SECTION (FROM THE EYE OF A MAN), SHOWING 



THE SCLEROTIC, IRIS, 



(E. A. S.) 



iris stroma. 



THE RELATIONS OF THE CILIARY MUSCLE TO 

 AND THE CAVERNOUS SPACES NEAR THE ANGLE OF THK ANTERIOR CHAMBER. 



The figure (which is copied from a photograph) includes only a small portion of the ciliary muscle, 

 the fibres of which are seen to be converging to a point immediately anterior to the angle of the anterior 

 chamber. Here they are attached through the medium of a tongue of fibrous tissue of the sclerotic 

 (consisting mainly of circular bundles) to the outer part of the ligamentum pectinatum, which forms 

 a loose tissue with open meshes lying between the canal of Schlemm and the anterior chamber. To the 

 right of the figure the fibres of the ligamentum pectinatum are seen to be gradually converging towards 

 the posterior surface of the cornea, and somewhat beyond the part shown in this figure they merge into 

 the membrane of Descemet. The communication of the canal of Schlemm, which is double in this 

 section, with the endothelial-lined spaces in the ligamentum pectinatum is seen, as also the communica- 

 tions between the last named spaces and the anterior chamber. 



are penetrated for a certain distance by glandular invaginations of the pigmented 

 epithelium which covers their free surface (Collins). These ciliary glands probably 

 assist in the secretion of the aqueous humour. 



The blood-vessels of the ciliary processes (fig. 34, d} are very numerous ; they 

 are derived from the anterior ciliary arteries and from the vessels of the fore part of 



