8o2 I'^eterhiary Obstetrics 



The membranes should not be divided, but should be removed 

 completely or left together attached to the uterus. One important 

 element in the normal detachment of the membranes is the weight 

 and volume of the chorion and umbilic cord. If the principal 

 volume and weight of these is removed, the tendency for the 



Fig. 139. Placentai, TuKTs from thk Chorion of the 

 Cow. ( Pomayer. ) 



remnant to continue to be retained is intensified. If the main 

 body of the chorion is torn away, and the placental tufts remain 

 imbedded in the cotyledons, the incarcerated portions lose the in- 

 fluence of traction, which is so necessary to their eventual re- 



