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 ?
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].