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A TEXTBOOK OF PHYSIOLOGY 



the aqueous chamber. These, at the comeo-iridic angle, become 

 reflected on to the iris, the membrane stopping short at the angle. 

 The inner fibres of the cornea in the neighbourhood of the corneo-iridic 

 angle continue on as longitudinal fibres cribriform ligament. This 

 ligament is also composed of circular fibres, which are continuous with 

 those surrounding the venous canal of Schlemm (Fig. 338). 



H.U 



FIG. 338. To SHOW DETAILS OF THE CRIBRIFORM LIGAMENT, CILIARY MTTSTLE, AND 

 CORNEO-IRIDIC JUNCTION. (Thomson Henderson.) 



The outer fibres of cribriform ligament start at a and end at o'. The inner fibres 

 start at b and spread out to act as fibrils of origin to the longitudinal fibres of the 

 ciliary muscle. P, pigment epithelium of iris; P.L.M., posterior limiting mem- 

 brane of iris continuous with hyaline layers (H.L.) of ciliary body; D.M ., Des- 

 cemet's membrane. 



By its inner longitudinal fibres it serves as a point of attachment 

 for the ciliary muscle and the dilator pupillse ; by its outer longitudinal 

 fibres it is connected to the solera, the fibres passing backwards internal 

 to the canal of Schlemm. The circular fibres help to keep the ciliary 

 muscle in position. 



The Sclerotic Coat (Sclera) is extremely tough, being made up of 

 white fibrous tissue with a small amount of yellow elastic tissue. It 

 is pierced at the back by the optic nerve, and at various parts by 

 the veins bringing blood from the eyeball (the venae vorticosae). The 

 muscles moving the eyeball are inserted into the sclera just behind 



