Coronary sinus and its tributaries.
In the present study we found absence of semilunar valve of the coronary sinus in 2 out of 150 hearts (1.33%) and anomalous opening of the middle cardiac vein in 3 out of 150 hearts (2.0%).
D003330:Coronary Vessel Anomalies / Q000175:diagnosis*; D003331:Coronary Vessels / Q000033:anatomy & histology*; D006801:Humans