interatrial foramen primum
- in the embryonic heart, the temporary opening between right and left atria situated between the lower margin of the septum primum and the atrioventricular canal cushions;
- in an adult heart, the abnormal persistence of the so-named communication, which is normal in young embryos.
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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.