When the placentation is dichorionic, separate fetal placental circulations are maintained whether the placentae are fused or separate.
The placentae of the experimental gravid monkeys demonstrated diffuse congestion of the intervillous space and coagulation necrosis.
Regardless of the appearance of the membrane this is a dichorionic gestation since there are separate placentae on opposing uterine walls.
Infarcts were evident in the placentae of dogs with aortic constriction.
With distant uterine implantation the two placentae will appear separate and their gross form classified as two discs.
An understanding of the relationship of the placentae and fetal membranes is crucial in comprehending chorionicity in twin gestations.
The placentae from six of the dogs with elevated thoracic arterial pressure were examined.
These lesions were absent in the placentae obtained from five normal pregnant rabbits.
