Epiblast

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Epiblast

The Epiblast (pronounced: /ˈɛpɪˌblæst/) is a term used in embryology to refer to a specific layer of cells that forms during the early stages of embryonic development.

Etymology

The term "Epiblast" is derived from the Greek words "epi", meaning "upon" or "above", and "blast", meaning "germ" or "sprout".

Definition

The Epiblast is the outermost layer of an embryo during the early stages of development, before the formation of the Gastrula. It is one of the two layers that form from the division of the Blastocyst's inner cell mass, the other being the Hypoblast. The Epiblast subsequently gives rise to all three primary Germ layers: the Ectoderm, Mesoderm, and Endoderm.

Related Terms

  • Blastocyst: An early stage in the development of an embryo, consisting of an inner cell mass and an outer layer known as the trophoblast.
  • Hypoblast: The layer of cells in the embryo that forms beneath the Epiblast during the early stages of embryonic development.
  • Gastrula: The stage of embryonic development that follows the blastula, characterized by the formation of three germ layers.
  • Ectoderm: The outermost germ layer, which gives rise to the nervous system and the epidermis.
  • Mesoderm: The middle germ layer, which gives rise to the muscles, bones, and circulatory system.
  • Endoderm: The innermost germ layer, which gives rise to the digestive and respiratory systems.

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