6o6 



TEXT-BOOK OF PHYSIOLOGY. 



is 3.6 mm., the diameter about 9 mm. It consists of a transparent 

 capsule containing elongated hexagonal fibers which, having their 

 origin near the anterior central portion of the lens, pass out toward 

 the margin, where they bend around to terminate in a triradiate 

 figure on the opposite side. Chemically the lens consists of water, 

 a globulin body (crystallin), and salts. 



The Suspensory Ligament. The lens is held in position by the 

 suspensory ligament, formed in part bv the hyahfld TngmhraT^ anH 

 in part by fibers derived fr^m th* n'liary precedes. The former be- 

 comes attacned to the posterior surface, the latter to the anterior 



FIG. 282. HORIZONTAL SECTION OF THE EYEBALL. i. Sclera. 2. Cornea. 3. 



Chorioid. 4. Iris. 5. Ciliary muscle. 6. Retina. 7. Lens. 8. Suspensory 



ligament. 9. Canal of Schlemm. 10. Canal of Petit, n. Optic nerve. 

 (Deaver.} 



surface of the lens near the equator. The space between the two 

 layers of the ligament is the canal of Petit. The anterior surface of 

 the ligament presents a series of plications conforming to correspond- 

 ing plications on the surface of the ciliary processes. 



The relations of all the parts entering into the structure of 

 the eye are shown in Fig. 282. 



