Tags: Anatomical Structure, Embryology.
In the developing heart of a human embryo the cavity of the primitive atrium becomes subdivided into right and left chambers by a septum the septum primum which grows downward into the cavity. The increasingly smaller gap below it (before it fuses with the endocardial cushion) is known as the ostium primum (i.e. the first opening). The septum primum eventually fuses with the endocardial cushion closing the ostium primum off completely.
