| Name: | germ ring |
|---|---|
| Synonyms: | |
| 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. |
| Ontology: | Anatomy Ontology [ZFA:0000111] |
| Name: | hypoblast |
|---|---|
| Synonyms: | mesendoderm |
| Definition: | The inner of the two layers of the blastoderm that forms during gastrulation and give rise to the definitive mesoderm and endoderm. |
| Ontology: | Anatomy Ontology [ZFA:0000117] |