TYPES OF (ESTROUS CYCLE 



33 



a deep spongy foundation, and a compact superficial layer 

 crowded with shallow crypts. At about eight to nine weeks 

 after oestrus, correlated with the atrophy of the corpus luteum, 

 regressive changes take place in the accessory organs. These 



^.r\i>; . f\:.y 



Fig. i6. — Uterine Mucosa of Dog at the end of 

 Pseudo-Pregnancy. 



Extra vasated blood is seen in the stroma. 



(From Marshall and Hainan). 



changes lead to the secretion of milk in the mammary glands, and 

 to the breakdown of capillaries and to the extravasation of blood 

 into the stroma of the uterus. In spite of a similarity to the 

 prooestrous phenomenon, this pseudo-pregnant degeneration 

 in the uterus is readily distinguished by a difference in the 

 p.s.o. c 



