Figure 6

The 3D model and gross specimen. A1 3D model of the 1^st sample. The SANA (in red) arises from the RCA and crosses the sulcus terminalis, penetrating the SAN (green circle). The SAN is located at the junction of the superior vena cava with the right atrium. A2 Corresponds to A1 and is the gross specimen of the 1^st sample. A3 and A4 Viewed from the base to display the course of the SANA (1 SANA; 2 SAN; 3 RCA; 4 aorta; 5 superior vena cava). B1 3D model of the 2^nd sample. The AVNA (in red) arises from the posterior interventricular branch of the right coronary artery, penetrating the atrioventricular junction. The AVN (green circle) is at the apex of the triangle of Koch. The HBB (purple region) is situated below the atrioventricular part of the membranous part (blue circle). B2 Corresponds to B1 and is the gross specimen of the 2^nd sample. B3 3D model of the 2^nd sample. The RBB (yellow region) goes towards the right side of the interventricular septum at the crest, penetrating the moderator band. Its nutritious artery is the septal artery (in red). B4 Gross specimen of the 2^nd sample and corresponds to B3 (1 AVNA; 2 AVN; 3 the tendon of Todaro; 4 atrioventricular part of the membranous septum; 5 RBB; 6 HBB; 7 opening of the coronary sinus; 8 first septal artery; 9 second septal artery; 10 moderator band). C1 and C2 3D model of the 3^rd sample. The LBB (yellow region) is situated at the lower rim of the membranous septum (green circle) and is supplied by both the anterior and posterior septal arteries (in red). C3 and C4 Gross specimen of the 3^rd sample was dissected with reference to the 3D model of the 3^rd sample (1 pulmonary trunk; 2 aorta; 3 right semilunar cusp; 4 left semilunar cusp; 5 posterior semilunar cusp; 6 membranous septum; 7 anterior septal arteries; 8 LBB; 9 posterior septal arteries; 10 nutritious arteries of LBB).