Fig. 190. — Human Placenta in situ, about Seven Months. Vertical Section. 

 ^w, Amnion. C^t?, Chorion. F?", Villous trunk, z/z, Sections of villi in the substance of the placenta. D' , D" , 

 Decidua serotina. Mc, Muscularis. Ve, Uterine artery, opening into the placenta ; the foetal blood-vessels 

 are drawn black ; the maternal blood-vessels white ; the chorionic tissue is stippled, except the canalized 

 fibrin, which is shaded by lines. The remnants of the gland cavities in the decidua are stippled dark. 

 X 6 diams. 



330 



