develops from adjacent to cardiac neural crest cardiac septum pulmonary trunk outflow tract septum dorsal aorta aortico-pulmonary spiral septum UBERON:0005999 aorticopulmonary septum EMAPA:16827 aortic septum Wikipedia:Aorticopulmonary_septum VHOG:0000502 EHDAA:2592 EHDAA2:0000136 CALOHA:TS-2409 The spiral septum that separates the truncus arteriosus into a ventral pulmonary trunk and the dorsal aorta[MP]. The aorticopulmonary septum is developmentally formed from neural crest, specifically the cardiac neural crest, and actively separates the aorta and pulmonary arteries and fuses with the interventricular septum within the heart during development. The actual mechanism of septation of the outflow tract is poorly understood, but is recognized as a dynamic process with contributions from contractile, hemodynamic, and extracellular matrix interactions. spiral septum uberon aortico-pulmonary septum UBERON:0006207