Embryonic Structure
primitive streak
prim·i·tive streak
Subclass of:
Embryonic Structures
Definitions related to 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.
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2025
  • A thickened, linear band on the dorsal aspect of the embryonic disc, which elongates by the addition of cells to its caudal end, establishing bilateral symmetry and representing the site of cell migration during gastrulation.
    NCI
    U.S. National Cancer Institute, 2021
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