Which is correct: interatrial OR intra-atrial septum? What medical word book/dictionary can this be found?

I know this might sound disgusting, but.?

Answers:
Looks like it is one word.

Septum, interatrial: The wall separating the upper chambers (the atria) of the heart. A hole in the interatrial septum is termed an atrial septal defect (ASD). http://www.medterms.com/script/main/art.asp?articlekey=5457

Interatrial septum: The partition separating the upper chambers (the atria) of the heart. http://www.talkmedical.com/medical-dictionary/7615/Interatrial-Septum

I want to see pictures of the human anatomy?

Other Answers:

can a person chew food with their eyelids?

General rule of thumb for medical terminology: "inter" means in between two cells or membranes, and "intra" means inside the cell itself. Interstitial fluid and Intrastitial fluid mean two totally different things just like Interatrial septum and Intraatrial septum. You do not have an Intraatrial septum, that would mean you would have a muscle inside the atrium which would not be very effective for pumping blood. You do have an Interatrial septum and it descibes the muscle in between your left and right atria which helps blood be pumped down into the ventricles.

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Which is correct: interatrial OR intra-atrial septum? What medical word book/dictionary can this be found?

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