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.


Please contribute to this project, if you have more information about this term feel free to edit this page



This page was last modified on 3 October 2005, at 21:16. This page has been accessed 4,719 times. 
What links here | Related changes | Permanent link