where a furrow in the outer surface of the heart will appear the interventricular foramen eventually disappears. This closure is achieved by further growth of the muscular interventricular septum, a contribution of trunk crest-conal tissue and a membranous component.

Valves and outflow tracts

Truncus septum formation and arterial cone

The arterial cone is closed by the infundibular cushions. The trunk cones are closed by the forming of an infundibulotroncal septum, which is made from a straight proximal portion and distal

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