Term: presumptive atrium heart tube anatomical region
Name: presumptive atrium heart tube
Synonyms:
Definition: Multi-tissue structure that is part of the heart tube and will become the cardiac atrium.
Ontology: Anatomy Ontology [ZFA:0001718]

Name: anatomical region
Synonyms:
Definition: A 3D region in space without well-defined compartmental boundaries; for example, the dorsal region of an ectoderm.
Ontology: Spatial Ontology [BSPO:0000070]