GENERATION AND DEVELOPMENT. 



The uterus (u, c, fig. 206) is a somewhat pyriform, fibrous 

 organ, with a central cavity lined with mucous membrane. 

 In the unimpregnated state it is about three inches in 

 length, two in breadth at its upper part, orfundus, but at its 



Fig. 207.* 



lower pointed part or neclt, only about half an inch. The 

 part between the fundus and neck is termed the body of 

 the uterus : it is about an inch in thickness. The walls 

 of the organ are composed of dense fibro-cellular tissue, 

 with which are intermingled fibres of organic muscle : in 

 the impregnated state the latter are much developed and 

 increased in number. The cavity of the uterus corresponds 



* Fig. 207. View of a section of the prepared ovary of the cat (from. 

 Schron). f. I, outer covering and free border of the ovary ; i', attached 

 border ; 2, the ovarian strorna, 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 Graafian 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, etc. ; 9', a follicle 

 from which the ovum has accidentally escaped ; 10, corpus luteum. 



