Amnion: Definition & Function

Amnion: Definition & Function
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  • 0:01 What Is the Amnion?
  • 0:40 Function of the Amnion
  • 1:59 Lesson Summary
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Lesson Transcript
Instructor: John Williams
The amnion is a thin membrane that forms the amniotic sac. It is necessary to protect a developing embryo within a mother during pregnancy. This lesson discusses the amnion and its functions.

What Is the Amnion?

Pregnancy is the period of time during which a child matures within the womb of the mother. This period is important for the development of a fetus (unborn offspring more than eight weeks after conception). During this time, the fetus must be protected from the internal environment of the mother's body, and this is achieved in many ways. One of the primary forms of protection is the amniotic sac, which is the protective sac and fluid that surrounds the fetus and prevents damage. The membrane that forms this sac is known as the amnion, and in this lesson, we will discuss the functions of this membrane as it helps protect the fetus.

Function of the Amnion

The amnion is a tough, thin membrane that surrounds a developing fetus in mammals, reptiles, and birds. For the purposes of this lesson, we will discuss the amnion in humans. In the human body, the amnion is the first of three cavities, including the chorion and yolk sac, that work together to keep the developing fetus nourished and protected. The amnion initially develops on the outside of the fetus and is in contact with the developing child.

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