Placenta.
Placenta.
Placenta.
Placenta (Apex)
Amniotic membrane or amniotic sac, containing the embryo and amniotic fluid.
Amnion chorion yolksac allantois
This is called the zygote. As it divides, it forms the embryo.
The cotyledon protects the embryo
Matrix
The amniotic sac is the sac in which the fetus develops in amniotes. Its wall is the amnion, the inner of the two fetal membranes. It encloses the amniotic cavity and the embryo.
Blastocyst.
neurilemma
The membrane that forms a sac around an animal embryo is called the amniotic sac. The embryonic sac is a bag of fluid inside of a woman's womb where the unborn baby develops and grows.