CHAP, in.] 



SIGHT. 



27 



fibres, giving rise to a number of irregular spaces, of varying sizes, 

 the spaces of Fontana ; and the membrane of Descemet with its 

 epithelioid covering is also split up and frayed out to supply a 

 cuticular and epithelioid wrapping to the bundles of the network. 



FIG. 140. DIAGRAM OF THE CILIARY MUSCLE AS SEEN IN A VERTICAL RADIAL 

 SECTION OF THE CILIARY REGION. 



E.cj. epithelium of the conjunctiva, d.cj. dermis of the conjunctiva. Scl. Sclerotic. 

 sp.ch. suprachoroidal layer. Ch. Choroid. p.e. pars ciliaris retinae and pig- 

 ment epithelium represented as one layer. C.P. Ciliary processes. I. Iris. 



ac/.h. anterior chamber. E.p. ligameutum pectinatum. 

 and x tissue to inside of it. 



c.S. canal of Schlemm, 



l.c.m. longitudinal, and c.c.m. circular ciliary muscle, y bundles of the longitudinal 

 muscle cut across as they are taking a circular direction. 



Thus, at the angle, a labyrinth of small irregular spaces is developed 

 continuous at many points with the large anterior chamber of the 

 eye as well as with each other ; and the bars forming the walls of 

 these spaces consist of bundles of the corneal substance passing on 

 to the iris, coated with a continuation of the cuticular elastic 

 membrane of Descemet and of the epithelioid covering of that 

 membrane. The spaces, thus continuous on the inner side with 

 the large lymphatic space of the anterior chamber, are small lym- 

 phatic spaces communicating on the outer side with the lymphatic 

 vessels of the choroid and sclerotic, as we shall see when we come 

 to deal specially with the lymphatics of the eye. The system of 

 bars defining these spaces, conspicuous through their coating 

 provided by the elastic membrane of Descemet, are spoken of as 

 forming the ligamentum pectinatum (Fig. 140 E.p.). They are 

 gradually lost in the peculiar choroidal stroma of the circumference 

 of the iris. 



In a vertical section of this region a somewhat large oval space, 

 lined by epithelioid cells, is conspicuous to the outer side of the 

 spaces of Fontana. This is the section of a circular canal, the canal 

 of Schlemm (Fig. 140 c.S.) which, though properly a lymphatic 



