CH. LVII.J THE OVARY. 799 



it contains within it an ovum formed from one of the primitive ova 



Fig. 61 1. View of a section of the ovary of the cat. i, outer covering and free border of 

 the ovary; i', attached border; 2, the ovarian stroma, presenting a fibrous and 

 vascular structure ; 3, granular substance lying external to the fibrous stroma ; 4, blood- 

 vessels ; 5, ovigerms in their earliest stages occupying a part of the granular layer near 

 the surface ; 6, ovigerms which have begun to enlarge and to pass more deeply into the 

 ovary ; 7, ovigerms round which the Oraafian follicle and tunica granulosa are now 

 formed, and which have passed somewhat deeper into the ovary and are surrounded by 

 the fibrous stroma ; 8, more advanced Graafian follicle with the ovum imbedded in the 

 layer of cells constituting the proligerous disc ; 9, the most advanced follicle containing 

 the ovum, &c. ; 9', a follicle from which the ovum has accidentally escaped ; 10, corpus 

 luteum. (Schrtin.) 



Fig. 612. Section of the ovary of a cat. A, germinal epithelium ; B, immature <>raiirlan 

 follicle ; C, stroma of ovary ; D, vitejline membrane containing the ovum ; K. Qmnfian 

 follicle showing lining cellu ; F, follicle from which the ovum has fallen out. (V. D. 

 Harris.) 



and it is lined by epithelium. At first there is simply one layer of 

 epithelium cells ; this lines the follicle and covers the ovum ; later 



