1. right atrium
2. right ventricle
3. right auricle
4. musculi pectinati
5. opening to vena cava
6. coronary sinus
7. fossa ovalis
8. cusps of tricuspid valve
9. chordae tendineae 
10. papillary muscles
11. pulmonary artery
12. aorta
13. innominate or brachiocephalic artery
14. trabeculae carnae 
15. left ventricle 
16. interventricular septum
17. bicuspid valve 
18. pulmonary semilunar valve
 

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