Grooves of the heart

1- Between the two atriums and the two ventricles there is an atrio ventricular groove which contains (Right coronary artery - circumflex aretery from left coronary artery - coronary sinus)
Between the two ventricles there are two grooves
1-anterior inter-ventricular groove which contains
)anterior inter-ventricular artery & great cardiac vein)
2-posterior inter-ventricular groove which contains(posterior inter-ventricular artery & middle cardiac vein