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 the primary interatrial foramen or ostium primum (interatrial foramen primum), below the free margin of the septum.
Read more about Primary Interatrial Foramen: Closing of Ostium Primum, Clinical Significance
Famous quotes containing the word primary:
“The primary imperative for women who intend to assume a meaningful and decisive role in todays social change is to begin to perceive themselves as having an identity and personal integrity that has as strong a claim for being preserved intact as that of any other individual or group.”
—Margaret Adams (b. 1916)