XIIl] FEMALE GENERATIVE ORGANS 195 



ovaries are capable of producing ripe ova, and ovulation may 

 occur, folloA^ed by the formation of t3'pical corpora lutea. 



At the prooestrous and oestrous periods when the ovaries are 

 in a state of enhanced activity as manifested especially by the 

 growth and maturation of the Graafian follicles, the uterus also 

 becomes active, imdergoing growth and congestion and the other 









V- -.y ::-.: :'■ ...v .^v.'- :s>«^-.v: •.•^'.>^^ 







Fig. 103. Tiiinsveise section tluouKli uterus of rat six months after trans- 

 plantation of ovary to ventral wall of peritoneum. The uterus is nomial. 

 (From Marshall.) ' 



changes characteristic of heat, as already described. Furthermore, 

 the mammarv glands become slightly swollen. It is not however 

 until a later period when the corpora lutea are formed in the ovaries 

 that the uterine mucous membrane undergoes the pronounced 

 hypertrophy characteristic of pregnancy or pseudo-pregnancy. 

 The mammary glands develop during the same period. More- 



