Interatrial septum: The partition separating the upper chambers (the atria) of the heart.
n. The wall between the atria of the heart.
inÃ‚Â·terÃ‚Â·aÃ‚Â·triÃ‚Â·al septum (n t r-tr-l) n. The wall between the atria of the heart. septum [sepÃ‚Â´tum] (L.) 1. a wall or partition dividing a body space or cavity.
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Brief and Straightforward Guide: What Is the Interatrial Septum?