interventricular groove posterior interventricular sulcus http://upload.wikimedia.org/wikipedia/commons/5/5f/Gray491.png posterior longitudinal sulcus posterior longitudinal sulci inferior interventricular groove FMA:7178 The ventricles are separated by two grooves, one of which, the anterior longitudinal sulcus, is situated on the sternocostal surface of the heart, close to its left margin, the other posterior longitudinal sulcus (posterior interventricular sulcus, inferior interventricular groove), on the diaphragmatic surface near the right margin. In it run the posterior interventricular artery and middle cardiac vein. sulcus interventricularis anterior posterior interventricular groove posterior interventricular groove UBERON:0005490 SCTID:277711007 diaphragmatic interventricular groove Wikipedia:Posterior_interventricular_sulcus