Embryogenesis

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Embryogenesis

Embryogenesis (pronunciation: /ˌɛmbri.oʊˈdʒɛnɪsɪs/) is the process by which the embryo forms and develops. It starts with the fertilization of an ovum, which then becomes a zygote and undergoes rapid cell division to form a blastocyst.

Etymology

The term "Embryogenesis" is derived from the Greek words "embryo" meaning "young one" and "genesis" meaning "origin".

Stages of Embryogenesis

Embryogenesis is divided into several stages:

Related Terms

  • Zygote: The cell formed by the union of two gametes; the fertilized ovum before it begins cell division.
  • Blastocyst: A preimplantation embryo consisting of a thin-walled hollow sphere of 16–64 cells.
  • Gastrula: An embryo at the stage following the blastula, when it is a hollow cup-shaped structure having three layers of cells.
  • Ectoderm, Mesoderm, and Endoderm: The three primary germ layers that form during gastrulation and from which all organs and tissues develop.

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