62 Diseases of the Genital Organs 



peritoneal cavity, is very narrow and the peritoneal cavity 

 is assumed to be physiologically sterile, the embryo lying in 

 the genital tube between the tubal and cervical openings, 

 once the uterine seal is physiologically formed, enjoys a high 

 degree of safety in these directions. Two vital dangers 



Fig. 30 — Same as Fig-. 29, showing a different type of Placental 

 Crypts with thickened, fibrous partitions possibly 

 due to prior disease 



remain. There is constant peril to the embryo from bacte- 

 ria, already old habitants of the utero-cervical cavity, and 

 there is a further threat of unknown potentiality from 

 micro-organisms floating in the blood of the mother, which 

 may invade the uterus from the blood stream. These dan- 



