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Primitive streak

primitive streak

An ectodermal ridge in the midline at the caudal end of the embryonic disk from which arises the intraembryonic mesoderm; achieved by inward and then lateral migration of cells; in human embryos, it appears on day 15 and gives a cephalocaudal axis to the developing embryo.

Synonym: germinal streak.


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difference between blastopore and primitive streak?

blastopore is a hole. primitive streak is a furrow. See here: http://en.wikipedia.org/wiki/Primitive_streak http://en.wikipedia.org/wiki/Blastopore

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by MrMistery
Mon Feb 04, 2008 9:18 pm
 
Forum: Human Biology
Topic: difference between blastopore and primitive streak?
Replies: 1
Views: 3336

embryonic development in a chick

... and what exactly are area pelucidia and area opaca? cant understand primitive streak as well as hensen node....arghh...and google is not helping! any recommendations for ...

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by cracked_doc
Mon Feb 04, 2008 7:40 pm
 
Forum: Zoology Discussion
Topic: embryonic development in a chick
Replies: 3
Views: 2728

difference between blastopore and primitive streak?

... Can some please explain to me the difference between a blastopore and primitive streak in embryogenesis? Thank you, L

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by cmbdii
Mon Feb 04, 2008 3:22 pm
 
Forum: Human Biology
Topic: difference between blastopore and primitive streak?
Replies: 1
Views: 3336

differentation and specialization of cells

... called gastrulation, not neurulation. Gastrulation takes place when the primitive streak occurs under the influence of beta - catenin and members of the TGF-beta-family.

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by sdekivit
Mon Aug 29, 2005 4:50 pm
 
Forum: Cell Biology
Topic: differentation and specialization of cells
Replies: 5
Views: 3808


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