atrium proper

atrium proper

the space anterior to the crista terminalis of the right atrium of the heart.
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References in periodicals archive ?
Unlike on the right, the junction of the LAA with the atrium proper is not marked either externally or internally by a crest or groove.
The Left Atrial Appendage (LAA) has developmental, ultra-structural and physiological characteristics distinct from the Left Atrium Proper.