Structures of Support

• Amnion: Transparent disk that form from cells of the embryonic disk. It surrounds the embryo completely and it is only penetrated by the umbilical cord. The amnion is filled with the amniotic fluid that protects the baby from injures and drastic temperature changes. 
• Yolk sac: Yolk sac in humans is responsible to provide the embryo blood cell, while it can produce by its own. It also contributes for the formation of the digestive tract.
• Allantois: Part of the umbilical cord. It is used to clean the waste of the baby.
• Chorion: The membrane that is part of the placenta.
• Placenta: disk shaped organ that is rich in blood-vessels. It transport nutrients to the fetus, cleans its waste. transport oxygen, secretes hormone, and transport antibodies from the mother into the fetus.