While the common atrium is arranged through septation into right and left atria the ventricle is separated into two chambers by the interventricular septum (IVS) 11-12. In contrast with septation of the atria, which is an active process, the subdivision of the ventricles is largely passive. In fact, whereas the two ventricles increase in size, the part between them (septum portion) does not grow with the heart and forms a constriction, the sulcus interventricularis. |
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Fig. 14 - Septation of the heart
side view |
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Legend |