Foramen secundum

The foramen secundum, or ostium secundum, is a foramen (opening) in the septum primum, a precursor to the interatrial septum of the embryological heart.

It should not be confused with the foramen ovale, which is a foramen in the septum secundum.

单词	Ostium secundum
释义	Ostium secundum 英语百科 Foramen secundum The foramen secundum, or ostium secundum, is a foramen (opening) in the septum primum, a precursor to the interatrial septum of the embryological heart. It should not be confused with the foramen ovale, which is a foramen in the septum secundum.
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Ostium secundum

Foramen secundum