GENEEAL CONSIDEEATIONS 



627 



the surface of which it again becomes continuous with the mesenchymal 

 epithelium of the fascia. Thus a serous sac or lymphatic space is formed 

 by the parietal layer of this sac,, which lines the orbital cavity, in conjunc- 

 tion with the visceral layer which covers the posterior two-thirds of the 

 globe of the eye; this sac is the capsule of Tenon. 



Epitfiefium 



Hlembrana terminatii 

 ant. 



limiions int. 

 Stratum nerveum 



(Cel/ulae nerveae) 

 Sppryiosa int. 



'ion retinae (Grana ml.) 

 Spongiosa ext. 

 Grana exf. 



limitotisext \CeUae 

 : et. ConijOptica 

 Cellulnn pigmentatae i 



Retina I 



Lobuli ad/pis 



Vasa cenholio 



Nervus opticus 



FIG. 537. HORIZONTAL SECTION OF THE RIGHT EYEBALL. 

 (From Fox, after Magnus.) 



The anterior third of the globe is covered by a reflection, at the 

 fornix conjunctivas,, of the conjunctival layer which clothes the inner 

 surface of the palpebrae or eyelids. The conjunctiva is a continuation of 

 the integument of the lid, modified so as to simulate a mucous membrane. 

 The portion associated with the eyelid is known as the palpebral con- 

 junctiva, that covering the eye as the ocular, bulbar or scleral con June- 



