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The wall of muscle separating the right and left atria is the interatrial septum. The interventricular septum separates the right and left ventricles.

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9y ago
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12y ago

As with many walls separating two chambers it is called the coronary/cardiac/heart septum. More acurately it is two separate septa the atrial septum and the ventricular septum.

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14y ago

the Endocardium.

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Q: What is the thick wall of muscle between the left atrium and right atrium of the heart called?
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