The<unk>  passes at first behind the pulmonary artery and then comes forward between that vessel and the<unk>  auricula to reach the<unk>  interventricular sulcus, along which it descends to the incisura apicis cordis.  In 78% of cases, it reaches the apex of the heart.  The<unk>  gives off two types of branches: septals and diagonals. In addition, the<unk>  can be divided into four segments (L1, L2, L3 and L4).
Left anterior descending artery
Left circumflex artery
Right coronary artery
Left coronary artery
Left main coronary artery
Right marginal branch of right coronary artery
Atrioventricular nodal branch
Posterior interventricular artery