aortopulmonary septum

a·or·to·pul·mo·nar·y sep·tum

the spiral septum that, during development, separates the truncus arteriosus into a ventral pulmonary trunk and a dorsal aorta.
See also: bulbar ridge.
References in periodicals archive ?
At CS16, the a-SMA-positive aortopulmonary septum formed and fused with the two OFT cushions, thus septating the nonmyocardial portion of the OFT into two arteries.
It is well known that the aortopulmonary septum and the OFT cushion contribute to aortopulmonary septation.[3],[4] According to Anderson, given that the aortopulmonary septum is a transient structure and does not persist in the postnatal heart, the term 'protrusion' is more accurate than 'septum.'[7] Henceforth, we will use the term 'protrusion' in this study.
During development, the common lumen of the distal outflow tract is initially divided into separate intrapericardial arteries by the aortopulmonary septum derived from the dorsal wall of the aortic arch [20].