Detail of the heart conduction system in a tricuspid atresia with VSD and transposition of the great arteries.
The aorta is arising from the small right ventricle.the aorta has been resected. The aortic valve, the right coronary sinus (3) and the left (2) are seen.
A large VSD (1) communicates the right and left ventricles.
The His bundle and the atrioventricular node are well demonstrated in this dissection.