| Name: | sinus venosus |
|---|---|
| Synonyms: | inflow tract |
| Definition: | Heart region collecting blood from the paired common cardinal veins and delivering to the atrium. One of four components of the heart. The sinus venosus also acts as a pacemaker and is the first to contract. |
| Ontology: | Anatomy Ontology [ZFA:0000154] |
| Name: | hypoplastic |
|---|---|
| Synonyms: | hypoplasia, underdeveloped |
| Definition: | A physical quality inhering in an organ or tissue by virtue of the bearer's exhibiting a decreased number of cells, typically associated with a decrease in size. |
| Ontology: | Phenotypic Quality Ontology [PATO:0000645] |