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Primitive streak - Revision history
2026-04-21T21:07:08Z
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<p><b>New page</b></p><div>'''Primitive Streak'''<br />
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The '''Primitive Streak''' is a structure that forms in the blastula during the early stages of avian, reptilian, and mammalian embryonic development. It establishes bilateral symmetry, determines the site of gastrulation and initiates germ layer formation. The primitive streak is the earliest trace of the embryo in the fertilized ovum.<br />
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== Formation ==<br />
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The primitive streak forms during the third week of embryogenesis. It begins as a small area of epiblastic cells at the caudal end of the embryonic disc. These cells proliferate and migrate towards the cranial end of the disc, forming a raised streak. This process is known as [[gastrulation]].<br />
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== Function ==<br />
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The primitive streak serves several key functions in embryonic development. It establishes the longitudinal axis of the embryo and determines the bilateral symmetry of the organism. It also serves as the site of [[gastrulation]], the process by which the three germ layers (ectoderm, mesoderm, and endoderm) are formed.<br />
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== Clinical Significance ==<br />
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Abnormalities in the formation of the primitive streak can lead to a variety of congenital disorders. These include [[caudal dysgenesis]], [[sirenomelia]], and [[situs inversus]]. In addition, the primitive streak is the site of origin for [[teratomas]], a type of germ cell tumor.<br />
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== See Also ==<br />
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* [[Gastrulation]]<br />
* [[Embryogenesis]]<br />
* [[Blastula]]<br />
* [[Germ layers]]<br />
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== References ==<br />
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<references /><br />
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[[Category:Embryology]]<br />
[[Category:Developmental biology]]<br />
[[Category:Human development]]<br />
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