| Namespace | MPheno.ontology | Obsolete | false |
| description | absence of the splanchnic mesodermal thickening which forms cranial and lateral to the developing neural plate; normally, angiogenic cell clusters (aka angioblastic cords) located in a horse-shoe shape configuration in the cardiogenic plate coalesce to form the right and left endocardial heart tubes which then fuse in cephalo-caudal direction to form a single primitive heart tube |
