Amniotic sac

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Amniotic Sac

The Amniotic Sac (pronounced: am-nee-OT-ik sak), also known as the amnion, is a thin but tough transparent pair of membranes that hold a developing embryo (and later fetus) until shortly before birth. The inner membrane, the amnion, contains the amniotic fluid and the fetus. The outer membrane, the chorion, contains the amnion and is part of the placenta.

Etymology

The term "Amniotic Sac" is derived from the Greek words "amnion" meaning "lamb" and "sakkos" meaning "sac". The term was first used in the 17th century.

Function

The primary role of the Amniotic Sac is to provide a protective environment for the developing fetus. The amniotic fluid within the sac helps to cushion the fetus from physical impact, provides a constant temperature, and allows for freedom of fetal movement which promotes muscular and skeletal development.

Related Terms

  • Amniotic Fluid: The protective liquid contained by the amniotic sac.
  • Chorion: The outermost membrane surrounding an embryo; it forms the fetal part of the placenta.
  • Placenta: An organ that develops in the uterus during pregnancy to provide oxygen and nutrients to the growing baby.
  • Embryo: An unborn offspring in the process of development.
  • Fetus: An unborn offspring, from the eighth week after fertilization until birth.

See Also

External links

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