Development of heart interior video

The heart was originally a single chambered. As development continues it becomes partitioned into 4 chambers- 2 atria and 2 ventricles.

The ostium primum is the opening between the left and right atria.  Later a septum secundum is formed so that the septum primum joins the endocardial  cushion leading to the formation of a septum secundum which later becomes converted into foramen ovale. The foramen ovale closes up at birth so that blood now runs from the right atrium to the right ventricle.

The interior of the heart

The single chambered heart soon gives rise to the formation of the endocardial cushion with still a wide communication between atria and ventricles. Septum primum is formed at the roof of the right atrium which approaches the cushion and forms the ostium primum between it and the cushion. It then becomes detached from the top with the formation of the ostium secundum behind it and obliteration of ostium primum as it joins the endocardial cushion. The ostium secundum then becomes the foramen ovale at the mature 6 weeks heart. With formation of the atrioventricular valves between the atria and ventricles becomes 4 chambered with only the foramen ovale as opening between the atria.





 Heart interior development video


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