Found in the right atrium of the heart, the<unk> is an embryonic remnant of the foramen ovale, which normally closes shortly after birth.  During adult life, it is seen as an oval depression in the inferior part of the interatrial septum.   The floor of the foramen ovale constitutes the fused wall of the septum primum . Occasionally, fusion is incomplete and the superior part of the floor shows a communication through to the left atrium and this is known as a patent foramen ovale.
At the superior margin of the<unk> is the limbus<unk> e<unk> .
Fossa ovalis 
Cutis rhomboidalis nuchae
Cumulus oophorus
Genu valgum
Os odontoideum
Clitoral crura
Pinus radiata
Anterior commissure of labia