1
2
3
4
5
6
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Septum spurium
Inlet of the sinus venosus
Dorsal septum atrio-ventriculare
Sulcus atrio-ventricularis
Atrium
Ventricle |
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1
2
3 |
Incorporation of the sinus venosus
into the right atrium
Pulmonary veins
Incorporation of the pulmonary veins into the left atrium |
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Fig. 24
Initially, only one pulmonary vein empties into the left atrium.
Fig. 25
More and more of the sinus venosus and the pulmonary vein become incorporated into the atrium.
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