Dissection of pericardium and heart in situ

Conduction system of heart.

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Image #118-2
Bassett ImageDiagram Image
Legend Image
Dissection of pericardium and heart in situ
Conduction system of heart.
The camera angle has been adjusted to provide a cross-sectional view of the interventricular septum (19). This septum has been retracted slightly away from the left ventricle and has been cut in such a way that the course of the atrioventricular bundle (6) can be traced from its origin in the A-V node (5) to its division into right and left branches (17, 18) at the junction of the membranous and muscular parts of the interventricular septum. The parts of the conduction system have been colored white to provide better photographic contrast.
1 . Superior vena cava
2 . Cut edge of wall of right atrium (note sinusoidal spaces filled with latex and continuous with cavity of atrium)
3 . Fossa ovalis
4 . Border of fossa ovalis
5 . Atrioventricular node (colored white)
6 . Trunk of atrioventricular bundle (colored white)
7 . Coronary sinus
8 . Septal (medial) cusp of tricuspid valve
9 . Posterior cusp tricuspid valve
10 . Myocardium of right ventricle
11 . Right ventricle
12 . Pulmonary trunk
13 . Left auricle
14 . Left coronary artery
15 . Aortic valve (left semilunar cusp)
16 . Membranous part interventricular septum (partially resected to display A-V bundle)
17 . Left crus atrioventricular bundle (colored white)
18 . Right crus atrioventricular bundle (colored white)
19 . Muscular part interventricular septum
20 . Latex cast in cavity of left ventricle