This section, cut in the frontal plane, in a human embryo at Carnegie stage 16, shows the entry of the pulmonary vein to the inferior aspect of the left.

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This section, cut in the frontal plane, in a human embryo at Carnegie stage 16, shows the entry of the pulmonary vein to the inferior aspect of the left side of the primary atrial component. This section, cut in the frontal plane, in a human embryo at Carnegie stage 16, shows the entry of the pulmonary vein to the inferior aspect of the left side of the primary atrial component. Note that the vein has entered through the dorsal mesocardium, and note its relation to the left sinus horn, which will persist as the coronary sinus. Antoon Moorman et al. Heart 2003;89:806-814 Copyright © BMJ Publishing Group Ltd & British Cardiovascular Society. All rights reserved.