part of part of connected to connected to Homo sapiens system heart right cardiac atrium heart blood vessel venous blood vessel systemic venous system coronary sinus http://upload.wikimedia.org/wikipedia/commons/5/5f/Gray491.png https://cdn.humanatlas.io/digital-objects/ref-organ/blood-vasculature-female/v1.3/assets/3d-vh-f-blood-vasculature.glb https://cdn.humanatlas.io/digital-objects/ref-organ/blood-vasculature-male/v1.3/assets/3d-vh-m-blood-vasculature.glb NCIT:C32378 sinus coronarius Wikipedia:Coronary_sinus UMLS:C0456944 sinus coronarius MESH:D054326 The short trunk that recieves most of the cardiac veins carrying the blood from the myocardium and delivers it to the right atrium, with the sinoatrial connection occurring between the inferior vena cava and the atrioventricular orifice. EHDAA2:0000320 The sinus, before entering the auricle, is considerably dilated - nearly to the size of the end of the little finger. Its wall is partly muscular, and at its junction with the great coronary vein is somewhat constricted and furnished with a valve consisting of two unequal segments EHDAA:9884 EMAPA:37836 FMA:4706 SCTID:244386006 UBERON:0005438