15 h 29 min, 22 sept. 2002 ans - First Trimester: Embryo
Description:
By week 4 the actual embryo is now forming. Alone with the amnion and yolk sac. The amnion is necessary because it surrounds and protects the embryo. It will later on also have more use. The yolk sac produces blood for the embryo.Ajouté au bande de temps:
Date:
15 h 29 min, 22 sept. 2002 ans
Maintenaint
~ Il y a 23 ans