In human embryology, the primary interventricular foramen is a temporary opening between the developing
ventricles of the heart. The ventricles arise as a single cavity that is divided by the developing
interventricular septum
The interventricular septum (IVS, or ventricular septum, or during development septum inferius) is the stout wall separating the ventricles, the lower chambers of the heart, from one another.
The ventricular septum is directed obliquely backwar ...
. Before the septum closes completely, the remaining opening between the two ventricles is termed the interventricular foramen.
In some individuals, the foramen fails to close, leading to an interventricular septal defect known as a patent interventricular foramen.
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References
Embryology of cardiovascular system
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