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Difference between Amnion and Chorion

Difference between Amnion and Chorion

When it comes to the development of a baby in the womb, there are three primary membranes that form around the embryo: the amnion, chorion, and yolk sac. These membranes play different roles in fetal development, and each has its own unique characteristics. Here’s a closer look at the difference between amnion and chorion.

What is Amnion?

Amnion is a thin, membrane-like sac that surrounds and protects the embryo during pregnancy. The amnion is filled with a clear fluid, called amniotic fluid, which helps to cushion the embryo and prevent it from being damaged. Amniotic fluid also allows the embryo to move around freely and develop properly. In addition, the amnion helps to regulate the temperature around the embryo and prevents it from becoming too hot or too cold. Without the amnion, the embryo would not be able to develop properly and would likely be miscarried.

What is Chorion?

Chorion is a membrane that covers the embryo of some reptiles, birds, and mammals. It is composed of an inner layer of epithelium and an outer layer of connective tissue. Chorion provides a barrier between the embryo and the external environment and helps to protect the embryo from infection. Chorion also aids in gas exchange and waste removal. In mammals, the chorion is fused with the wall of the uterus and is known as the chorion laeve. Chorion laeve helps to prevent implantation of the embryo in the wrong place, such as in the fallopian tubes or elsewhere outside the uterus. It also provides nutrients to the embryo and helps to regulate its temperature.

Difference between Amnion and Chorion

Amnion and chorion are two different types of membranes that surround the embryo in the womb. Amnion is a thin, transparent membrane that encloses the embryo and is filled with fluid. Chorion is a thicker, opaque membrane that covers the amnion and is lined with blood vessels. Amnion and chorion work together to protect the embryo from infection and allow for proper growth and development. Amnion also helps to regulate the temperature around the embryo, while chorion helps to exchange nutrients and waste products between the embryo and the mother. Together, these two membranes play a vital role in supporting a healthy pregnancy.


The amnion and chorion are two of the fetal membranes that make up the placenta. The amnion is a thin, transparent membrane that surrounds the fetus and contains the amniotic fluid. The chorion is a thicker membrane that surrounds the amnion and helps to transfer nutrients from mom to baby. These membranes work together to create a healthy environment for fetal development.

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