Amnions – Definition & Meaning

Amnions are a vital part of fetal development in mammals. They are the sacs that contain the developing fetus and the amniotic fluid that surrounds it. The amniotic sac is a protective layer that provides a safe environment for the fetus to grow and develop. In this article, we will explore the definition and meaning of amnions.

Definitions

Amnions are the innermost layer of the fetal membranes, which surround the developing fetus. They are filled with amniotic fluid, which provides a cushioning effect to protect the fetus from external shocks. The amniotic sac is made up of two layers: the amnion and the chorion. The amnion is the innermost layer, while the chorion is the outermost layer.

Origin

The word “amnion” comes from the Greek word “amnos,” which means “lamb.” This is because the amniotic sac was first observed in sheep embryos. The amniotic sac is also found in other mammals, including humans.

Meaning in different dictionaries

According to the Merriam-Webster dictionary, amnions are “the innermost of the fetal membranes of higher vertebrates (as humans) especially when forming a sac containing the amniotic fluid.” The Oxford English Dictionary defines amnions as “the innermost membrane surrounding the embryo of a vertebrate, filled with amniotic fluid in which the embryo floats.”

Associations

Amnions are associated with fetal development and pregnancy. They play a crucial role in protecting the developing fetus and providing a safe environment for it to grow and develop. Amniotic fluid also helps to regulate the temperature of the fetus and provides a medium for the exchange of nutrients and waste products.

Synonyms

Synonyms for amnions include amniotic sac, fetal membrane, and embryonic membrane.

Antonyms

There are no direct antonyms for amnions, as they are a unique aspect of fetal development.

The same root words

The word “amnion” comes from the Greek word “amnos,” which means “lamb.” This same root word is also found in other words, such as “amniotic” and “amnestic.”

Example Sentences

1. The amnions provide a protective layer around the developing fetus.
2. The amniotic fluid in the amnion helps to cushion the fetus from external shocks.
3. The amnion and chorion together form the amniotic sac.
4. The doctor checked the amniotic fluid levels in the amnion during the ultrasound.
5. The amniotic sac ruptured, and the amniotic fluid leaked out, signaling the start of labor.