GENERAL CONSIDERATIONS 



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. 



Iflembrana (erminaltj 



\ centrolit 

 Menus opficm 



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- 



