What does primitive streak mean?
Definitions for primitive streak
prim·i·tive streak
This dictionary definitions page includes all the possible meanings, example usage and translations of the word primitive streak.
Wikidata
Primitive streak
The primitive streak is a structure that forms in the blastula during the early stages of avian, reptilian and mammalian embryonic development. The presence of the primitive streak will establish bilateral symmetry, determine the site of gastrulation and initiate germ layer formation. To form the streak, reptiles, birds and mammals arrange mesenchymal cells along the prospective midline, establishing the first embryonic axis, as well as the place where cells will ingress and migrate during the process of gastrulation and germ layer formation. The primitive streak extends through this midline and creates the antero-posterior body axis, becoming the first symmetry-breaking event in the embryo, and marks the beginning of gastrulation. This process involves the ingression of mesoderm and endoderm progenitors and their migration to their ultimate position, where they will differentiate into the three germ layers that will give rise to all the tissues of the adult organism.
U.S. National Library of Medicine
Primitive Streak
A linear band of rapidly proliferating cells that begins near the posterior end of an embryo and grows cranially. Primitive streak is formed during GASTRULATION by the convergent migration of primary ectodermal cells (EPIBLAST). The knot at the tip of the streak is called HENSEN NODE.
Numerology
Chaldean Numerology
The numerical value of primitive streak in Chaldean Numerology is: 4
Pythagorean Numerology
The numerical value of primitive streak in Pythagorean Numerology is: 6
Translations for primitive streak
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"primitive streak." Definitions.net. STANDS4 LLC, 2024. Web. 25 Apr. 2024. <https://www.definitions.net/definition/primitive+streak>.
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