CANAL OF SOHLEMM. 



21 



ference of Descemet's membrane, the name ligamentum pectinatum was given by 

 Hueck. They are sometimes known as the pillars of the iris. The fibres which 

 pass to the iris are very much more marked in the eyes of the sheep and the ox 

 than in the human eye. The bundles of the ligamentum pectinatum are covered 

 with endothelial cells, continued from Descemet's membrane, but these cells do not 

 stretch across the intervals between the bundles, so that the cavity of the aqueous 

 chamber is prolonged into, and freely communicates with spaces in the tissue 



tissue of insertion of canal of canal of 



sderotic. ciliary muscle. Schlemm. Schlemm. 



tissue of 

 cornea. 



I 





ciliary muscl 



uveal pigment of iris. 



iris stroma. 



Fig. 22. SUCTION (FROM THK EYE OP A MAN), SHOWING THE RELATIONS OF THE CILIARY MUSCLE TO 



THE SCLEROTIC, IRIS, AND THE CAVERNOUS SPACES NEAR THE ANGLE OF THE ANTERIOR CHAMBER. 



(E. A. S.) 



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 cdrnea, 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 

 communications between the last-named spaces and the anterior chamber. 



between the bundles (fig. 22). These spaces are much larger and more distinct 

 in some animals than in man, and in them they have received the name of spaces 

 of Fontana. A similar, but rather larger space is found immediately in front of 

 the ligamentum pectinatum in the substance of the sclerotic, close to its junction 

 with the cornea. This circular space, which is elliptical in section, is known as the 

 sinus circular is iridis, or canal of Schlemm (fig. 22, 4). 



