aorticopulmonary septum(redirected from Spiral septum)
Also found in: Dictionary, Thesaurus, Legal, Encyclopedia.
a septum dividing the embryonic bulbus cordis and truncus arteriosus into pulmonary and aortic outflow tracts from the developing heart; the distal part of the septum is derived from the right and left endocardial cushions and so separates the pulmonary and aortic orifices; the proximal part of the septum is that portion of the septum incorporated into the membranous part of the interventricular septum.
a septum, formed by fusion of the bulbar ridges, that divides the bulbus cordis into aortic and pulmonary trunks.
part of the embryonic development of separating the cardiac chambers from the primordial single sac.