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== Animal Embryonic Development ==

[[Animal embryonic development]], also known as [[embryogenesis]], is the process by which the [[embryo]] forms and develops. It starts with the [[fertilization]] of an [[ovum]], which is then followed by the formation of a [[zygote]]. The zygote undergoes rapid mitotic divisions with no significant growth, producing a [[blastula]], which further develops into a [[gastrula]].

=== Fertilization ===

[[Fertilization]] is the fusion of two [[gametes]] to form a [[zygote]]. The sperm and egg each contribute half the genetic material needed for the new individual. The process of fertilization and the formation of the zygote are the initiating events in the life history of the organism.

=== Cleavage ===

Following fertilization, the zygote begins to divide by [[mitosis]] in a process called [[cleavage]]. Cleavage is a series of rapid cell divisions that results in an increase in the number of cells but not their size. This process transforms the zygote into a small, multicellular organism, known as a [[blastula]].

=== Gastrulation ===

[[Gastrulation]] is a significant phase in the embryonic development of most animals, during which the single-layered blastula is reorganized into a trilaminar ("three-layered") structure known as the [[gastrula]]. These three germ layers are known as the [[ectoderm]], [[mesoderm]], and [[endoderm]].

=== Organogenesis ===

[[Organogenesis]] is the process by which the three germ layers formed from gastrulation develop into the internal organs of the organism. The cells interact and develop into complex tissues and organs, completing the formation of the three primary germ layers: ectoderm, mesoderm, and endoderm.

== See also ==

* [[Embryo]]
* [[Zygote]]
* [[Blastula]]
* [[Gastrula]]
* [[Ectoderm]]
* [[Mesoderm]]
* [[Endoderm]]
* [[Organogenesis]]

== References ==

<references />

[[Category:Developmental biology]]
[[Category:Embryology]]
[[Category:Animal anatomy]]

{{anatomy-stub}}

Animal embryonic development - Revision history

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