The early processes of cardiac formation, in particular the forming of the loop, are very interesting from many points of view. A long, closed tube arises out of the endocardial plexus. This tubular heart largely represents the anlage for the trabeculated part of the future right and left ventricles (3). The outflow tract, cone and the atrium make up here only a small part. Since the curvatures of the heart take place in various planes, the following interactive diagrams show them in two views.
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