64 Diseases of the Genital Organs 



equidistant points in the cornu corresponding to the ovary 

 from which the ova emanated. If but one embryo is pres- 

 ent in a horn, it is ordinarily near its base, and very rarely 

 may become, as in the mare, bicornual. When near full 

 term, the fetuses may be very irregularly located, owing to 

 the fact that one or several of them has perished and later 

 has been absorbed. 



Fig. 32 — Left. Uterine Cotyledon of Ewe, 

 from which Fetal Cotyledon has been removed, leaving a cavity. 

 Right. Median section of Maternal and Fetal Cotyledon of Ewe, 

 with portion of Chorion attached. 



At the point where a fertilized ovum becomes located 

 within the uterus, the adjacent uterine walls promptly as- 

 sume increased functional activity, become increased in 

 thickness, and show heightened vascularity. The vital 

 changes occur in the endometrium, and particularly in the 

 placental areas. In ruminants with multiple cotyledonal 

 placentae, the placental areas are already visible in the 

 uterus of the female fetus as definite elevations in the uterine 

 mucosa. When the existing placental areas or caruncles of 



