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:
- Fertilization: This is the fusion of the sperm and ovum to form a zygote.
- Cleavage: This is the stage where the zygote undergoes rapid cell division without growing in size, forming a blastocyst.
- Gastrulation: This is the stage where the blastocyst transforms into a gastrula by developing three germ layers: the ectoderm, mesoderm, and endoderm.
- Organogenesis: This is the stage where the germ layers develop into the different organs of the body.
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.
External links
- Medical encyclopedia article on Embryogenesis
- Wikipedia's article - Embryogenesis
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