Assertion: left atrium | /r/HasSubevent | three atrial chambers
Facets:
Source sentences:
text: Cor triatriatum (or triatrial heart) is a congenital heart defect where the left atrium (cor triatriatum sinistrum) or right atrium (cor triatriatum dextrum) is subdivided by a thin membrane, resulting in three atrial chambers (hence the name).