THE REFRACTING MEDIA 



1019 



the suspensory ligament there is a sacculated canal, the spatia zonularis (canal 

 of Petit], which encircles the equator of the lens; it can be easily inflated through 

 a fine blowpipe inserted under the suspensory ligament. 



No bloodvessels penetrate the vitreous body, so that its nutrition must be carried 

 on by vessels of the retina and ciliary processes, situated upon its exterior. 



INSERTION OF 

 TENDON OF SUPER! 



RECTUS MUSCLE 



PAHS OPTICA 

 RETIN/E 

 ORA SERRATA 

 PARS CILIARIS RETIN/E 



ANTERIOR CILIARY 

 ARTERIES AND 



CIRCULAR 

 MAJOR 



POSTERIOR 



SURFACE 



OF CORNEA 



EPITHELIUM 



OF CORNEA 



ANTERIOR 



ELASTIC 



LAMINA 



PIGMENTARY LAYER 

 OF RETINA 

 CHOROID 



PERICHOROIDALSPACE 



CIRCULAR 

 FIBERS 

 CILIARY 

 PROCESS 



RADIATING FIBERS 

 OFZONULEOFZINN 

 ZONULE OF ZINN 

 ZONULAR SPACES 



POSTERIOR CHAMBER 

 OF EYE 



EPITHELIUM OF 

 LENS CAPSULE 

 CAPSULE 

 OF LENS 



NT.CHAMBER 

 OF EYE 



ANGLE OF 

 ANTERIOR 

 CHAMBER 

 CANAL O 

 SCHLEMM 



CONJUNCTIVA 

 EPISCLERAL 

 CONNECTIVE- 

 TISSUE 

 LIGAMENTUM 

 PECTINATUM 

 IRIDIS 

 RIMA 

 CORNEALIS 



EDGE OF 

 CORNEA 



mis (ante- 

 rior surface) 



CORTICAL SUBSTANCE 

 'OF LENS 



NUCLEUS 

 OF LENS 



POSTERIOR ELASTIC 

 LAMINA 



SPHINCTER 

 OF PUPIL 



STROMA OF IRIS 

 PIGMENTARY 

 LAYERS OF IRIS 



FIG. 883. The upper half of a sagittal section through the front of the eyeball. 



The Crystalline Lens (lens crystallind). The crystalline lens, enclosed in .its 

 capsule, is situated immediately behind the iris, in front of the vitreous body, 

 and encircled by the ciliary processes, which slightly overlap its margin. 



The capsule of the lens (capsula lentis) is a transparent, structureless membrane 

 which closely surrounds the lens, and is thicker in front than behind. It is brittle 

 but highly elastic, and when ruptured the edges roll up with the outer surface 

 innermost. It rests, behind, in the hyaloid fossa in the forepart of the vitreous 

 body; in front, it is in contact with the free border of the iris, but recedes from it 

 at the circumference, thus forming the posterior chamber of the eye; it is retained 

 in its position chiefly by the suspensory ligament of the lens, already described. 



The lens is a transparent, biconvex body, the convexity of its anterior being 

 less than that of its posterior surface. The central points of these surfaces are 

 termed respectively the anterior and posterior poles; a line connecting the poles 

 constitutes the axis of the lens, while the marginal circumference is termed the 

 equator. 



