Uterine muscle 

 Remains of umbilical 

 vesicle 



Fetal villi of. 

 chorion 



Maternal blood 



sinus 

 Decidua basalis 



Placental septum 



Peripheral vein 



Fused decidua vera and 

 capsularis 



Chorion- 

 Amnion 



Fig. 249. — Semidiagrammatic section of uterus, showing relations of fetal and maternal placenta 



(Ahlfeld). 

 Decidua serotina, old terminology for decidua basalis; d. reflexa, old terminology for d. capsularis. 



