The primitive streak is a structure that forms during the early stages of avian, reptilian and mammalian embryonic development[WP]. the midline ridge of the embryonic epiblast that later develops into mesoderm and endoderm[MP]. [ MP:0002231 ]

This is just here as a test because I lose it

Term information


pheno_slim, early_development

depicted by

dubious for taxon

external ontology notes

VHOG includes a very broad grouping here based on

has exact synonym

primitive streak - blastopore - germ ring

homology notes

(...) the blastopore equivalent of chordates (germ ring in fish, marginal zone/blastopore lip in frog and node/primitive streak in chick and mouse) (...) (reference 1); Indeed, the primitive streak has been considered the homologue of the blastopore since the 1870s (reference 2).[well established][VHOG]