Ovary
chorion
There is no such thing as an "ovarian sac". The amnion is a membrane building the "amniotic sac" that surrounds and protects an embryo.
Amnion chorion yolksac allantois
The allantois, yolk sac and part of chorion.
The allantois, yolk sac and part of chorion.
Ovary
Ovarian follicle
The fetal membrane layers are the Chorion, Amnion, Yolk sac, and Mesenchymal layer.
An ovarian cyst is a sac of fluid that forms on or in an ovary. An ovarian cyst with coefficient 7.813 is considered to be moderately abnormal.
Amnion is the membrane that covers the embryo. Chorion is the membrane that covers the amnion, the yolk sac, and the allantois. The space delimited by the chorion and the amnion is called amniotic cavity and it is filled with aminiotic fluid. The amniotic cavity has the functions of preventing desiccation of the embryo and of protecting it against mechanical shocks.
When an ovarian cyst ruptures, the fluid ends up in the cul-de-sac due to gravity.