In the fetal heart, the<unk> (or ostium secundum of Born) allows blood to enter the left atrium from the right atrium. It is one of two shunts, the other being the ductus arteriosus, that allows blood entering the right atrium to bypass the pulmonary circulation. Another similar adaptation in the fetus is the ductus venosus. In most individuals, the<unk> closes within the first year after birth to form the fossa<unk> s.
Foramen ovale 
Cerebral crus
Limbus of fossa ovalis
Posterior interventricular sulcus
Lateral sulcus
Tentorium cerebelli
Anterior commissure
Anterior interventricular sulcus