Atrium dextrum and Atrium of the heart

Atrium dextrum noun - The right upper chamber of the heart that receives blood from the venae cavae and coronary sinus.

Atrium of the heart and atrium dextrum are semantically related. In some cases you can use "Atrium of the heart" instead a noun phrase "Atrium dextrum".

Atrium of the heart noun - The upper chamber of each half of the heart.

Atrium dextrum and atrium of the heart are semantically related. Sometimes you can replace phrase "Atrium dextrum" with "Atrium of the heart", this phrases are similar.