| The one that is visible at the earliest stage of development is the amnion. |
| The amnion is thin and difficult to visualize and best seen when perpendicular to the ultrasound beam. |
| Human amnion has been suggested for use as a biologic burn dressing, especially in developing countries. |
| Surrounding and protecting the embryo is the amnion, filled with amniotic fluid, and providing the embryo with a stable fluid environment. |
| Care was exercised not to separate the amniotic sac into its components, the chorion and amnion. |
| The allantois forms as an outpocketing of the embryo's hindgut and grows outward into the space between the amnion and chorion. |
