The thickend rim of the blastoderm evident during late blastula and gastrula stages[FishBase]. Embryonic structure which is a uniform thickened annulus at the blastoderm margin, consisting of two layers in addition to the EVL, the epiblast and the hypoblast. The germ ring is formed by the involution of the blastoderm back upon itself[ZFA]. [ ]

This is just here as a test because I lose it

Term information

database cross reference
  • AAO:0000211
  • MAT:0000255
  • ZFA:0000111
  • MIAA:0000255
  • EFO:0003427
  • TAO:0000111

efo_slim, early_development

dubious for taxon

editor note

TODO - check timing of appearance and disappearance - check relationship with primitive streak. he blastopore lips in amphibians appear to have the equivalent function of the germ ring in zebrafish (ES)

external definition

Embryonic structure that forms as a thickened annulus at the blastoderm rim. The germ ring is thickened because it is the involuting margin of the blastoderm[ZFIN:ZDB-PUB-961014-576].