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Figure 3: (a-d) This composite figure shows a van Gieson-stained sections of the atrioventricular node (a) plus the penetrating atrioventricular node (b), the His bundle (c), and its right and left bundle branches (d) in a fetal heart of 28 weeks. Ao: Aorta, IVS: Interventricular septum, LBB: Left bundle branch, MS: Membranous septum, MV: Mitral valve, RBB: Right bundle branch, RFT: Right fibrous trigone, TV: Tricuspid valve

Figure 3: (a-d) This composite figure shows a van Gieson-stained sections of the atrioventricular node (a) plus the penetrating atrioventricular node (b), the His bundle (c), and its right and left bundle branches (d) in a fetal heart of 28 weeks. Ao: Aorta, IVS: Interventricular septum, LBB: Left bundle branch, MS: Membranous septum, MV: Mitral valve, RBB: Right bundle branch, RFT: Right fibrous trigone, TV: Tricuspid valve