58 



INTERNAL SECRETIONS OF THE OVARY 



the nipple. At this stage, however, the development of the 

 gland stops until ovulation has taken place and luteal activity 

 begins. Under the influence of the corpus luteum the third 

 phase of mammary development, the appearance of bud-like 



Fig. 31. — Photograph of Mammary Gland of Rabbit 

 AFTER Pseudo-Pregnancy. 



The lobules of alveoli are undergoing atrophy, but complete return 

 to the virgin condition (Fig. 29) is not found. 



Structures at the end of the ducts and the growth of nests of 

 alveoli, is started. In the absence of pregnancy no further 

 development than this occurs, and the degenerative phase, 

 which coincides with the atrophy of the corpora lutea at the end 

 of pseudo-pregnancy, results in the appearance of a small 



