- atrium cordis, atrium of the heart - the upper chamber of each half of the heart
--1 is a kind of atrium
--1 has parts:
--1 has particulars:auricle, atrial auricle, auricula atrii; auricula, auricular appendage, auricular appendix right atrium, right atrium of the heart, atrium dextrum; left atrium, left atrium of the heart, atrium sinistrum