09/18/2025
In this video you see both the chorionic layer of the bag and amnionic layer of the bag where the amniotic fluid and baby resides until birth.
Amnion
Location: The inner layer of the amniotic sac, directly enclosing the fetus.
Structure: A single, thin, cellular layer of epithelial cells, rich in collagen, that acts as a structural barrier.
Function: Protects the fetus from mechanical shock, supports hydration, and contains growth factors and cytokines to promote healing.
Clinical Use: Used in wound healing and for ophthalmic injuries due to its anti-inflammatory and regenerative properties.
Chorion
Location: The outer layer, surrounding the amniotic sac and closer to the uterine wall.
Structure: A thick, cellular layer composed of dense collagen fibers, proteoglycans, and elastic fibers.
Function: Acts as an immunological buffer, preventing the maternal immune system from attacking the fetus, and facilitates oxygen and carbon dioxide exchange.
Clinical Use: Less common than the amnion in its stand-alone therapeutic applications for healing.
Key Differences
Position: Amnion is the inner membrane, chorion is the outer membrane.
Composition: The amnion is a thin cellular layer, while the chorion is a thicker, more cellular layer.
Role: The amnion is primarily a protective and hydrating membrane, whereas the chorion's main role is immunological protection and gas exchange.
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