Ostium primum
Ostium primum
Definition
In the developing heart, the atria initially communicate with each other by an opening between the free edge of the septum primum and the AV cushions, known as theprimary interatrial foramen or ostium primum (interatrial foramen primum), below the free margin of the septum.
References
This definition incorporates text from the wikipedia website - Wikipedia: The free encyclopedia. (2004, July 22). FL: Wikimedia Foundation, Inc. Retrieved August 10, 2004, from http://www.wikipedia.org
