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Medical Term:

interatrial foramen primum

Definition

  1. 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;
  2. in an adult heart, the abnormal persistence of the so-named communication, which is normal in young embryos.

Synonym(s): foramen subseptale, ostium primum, primary interatrial foramen

© Copyright 2017 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.
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