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			<gallery>
			File:Embryo_7_weeks_after_conception.jpg\|Embryo 7 weeks after conception
			File:Embryonic_development_of_a_salamander,_filmed_in_the_1920s.ogv\|Embryonic development of a salamander, filmed in the 1920s
			File:Wrinkledfrog_embryos.jpg\|Wrinkled frog embryos
			File:Mouse_and_Snake_Embryos.jpg\|Mouse and snake embryos
			File:Ginkgo_embryo_and_gametophyte.jpg\|Ginkgo embryo and gametophyte
			</gallery>

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2024-02-22T19:53:34Z

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'''Embryo''' is a term used in [[biology]] to refer to the early developmental stages of a multicellular organism. In humans, it is the stage of [[prenatal development]] from the moment of [[fertilization]] until the end of the eighth week of gestational age, after which it is then referred to as a [[fetus]].

==Development==
The development of the embryo follows [[fertilization]], and continues as a [[cellular proliferation]] and [[cellular differentiation]] which leads to the development of many [[cell types]], tissues and organs. This process is guided by the [[genetic information]] carried by the embryo's cells.

==Stages of Embryonic Development==
The stages of embryonic development include the [[zygote]], [[morula]], [[blastocyst]], [[gastrula]], and [[neurula]] stages. Each stage is characterized by specific cellular events and changes.

===Zygote===
The [[zygote]] is the initial cell formed when two [[gamete]] cells are joined by means of [[sexual reproduction]].

===Morula===
The [[morula]] is an early stage [[embryo]] consisting of cells (called [[blastomeres]]) in a solid ball contained within the [[zona pellucida]].

===Blastocyst===
The [[blastocyst]] is a structure formed in the early development of mammals, and it possesses an inner cell mass, which forms the [[organism]], and an outer layer of cells, or [[trophoblast]], which forms the [[placenta]].

===Gastrula===
The [[gastrula]] is a phase early in the embryonic development of most animals, during which the single-layered [[blastula]] is reorganized into a multilayered structure known as the [[gastrula]].

===Neurula===
The [[neurula]] is a stage in vertebrate embryonic development, in which the [[neural tube]] forms.

==See Also==
* [[Fertilization]]
* [[Prenatal development]]
* [[Cellular differentiation]]
* [[Zygote]]
* [[Morula]]
* [[Blastocyst]]
* [[Gastrula]]
* [[Neurula]]

[[Category:Biology]]
[[Category:Developmental biology]]
[[Category:Embryology]]

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Embryo - Revision history

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