| Name: | heart primordium |
|---|---|
| Synonyms: | cardiac field, heart primordia |
| Definition: | Bilateral groups of cells consisting of three rows: one row of endocardial precursors medially and two rows of myocardial precursors laterally. The two populations fuse at the midline between 21 and 26 somites to form the heart rudiment or cone. |
| Ontology: | Anatomy Ontology [ZFA:0000028] |
| Name: | decreased size |
|---|---|
| Synonyms: | hypoplasia, small, tiny, underdeveloped |
| Definition: | A size quality which is relatively low. |
| Ontology: | Phenotypic Quality Ontology [PATO:0000587] |