Written by the Fiveable Content Team • Last updated September 2025
Written by the Fiveable Content Team • Last updated September 2025
Definition
The amnion is a thin, protective membrane that surrounds the embryo or fetus during development in the uterus. It contains amniotic fluid, which cushions and protects the developing baby by maintaining a stable environment.
An organ that develops in the uterus during pregnancy, providing oxygen and nutrients to your growing baby while removing waste products from the baby's blood.
An early stage of development in multicellular organisms, in humans, it refers to the developing organism from fertilization until approximately eight weeks