| Name: | atrium |
|---|---|
| Synonyms: | |
| Definition: | Cavitated compound organ that receives inflow of deoxygenated blood and delivers it to a muscular cardiac ventricle. Valves are present to direct flow. There are only two chambers present in the fish heart. |
| Ontology: | Anatomy Ontology [ZFA:0000471] |
| Name: | cardiac jelly |
|---|---|
| Synonyms: | |
| Definition: | The extracellular matrix between the myocardium and the endocardium. The cardiac jelly plays a central role in the septation of the heart and comprises most of the thickness of the heart wall at early stages, but disappears as the heart differentiates. |
| Ontology: | Anatomy Ontology [ZFA:0001318] |