| 1
.
| Ascending aorta |
| 2
.
| Reflection of pericardium onto superior vena cava |
| 3
.
| Right coronary artery (cut off) |
| 4
.
| Sinoatrial node |
| 5
.
| Upper pointer: Interventricular septum (membranous part) Lower pointer: Right fibrous trigone (exposed by removal of atrial myocardium) |
| 6
.
| Border of fossa ovalis |
| 7
.
| Fossa ovalis |
| 8
.
| Myocardium of right atrium (left pointer indicates position of a delicate tendon which extends from the right fibrous trigone toward the border of fossa ovalis) |
| 9
.
| Upper pointer: Latex cast in coronary sinus Lower pointer: Valve of coronary sinus |
| 10
.
| Valve of inferior vena cava |
| 11
.
| Latex cast in inferior vena cava |
| 12
.
| Septal (medial) cusp of tricuspid valve |
| 13
.
| Pulmonary trunk |
| 14
.
| Valve of pulmonary trunk (pointer on left semilunar cusp) |
| 15
.
| Right crus atrioventricular bundle |
| 16
.
| Atrioventricular node (no distinct boundary found between node and myocardium inferior to it) |
| 17
.
| Septomarginal trabecula (moderator band) |
| 18
.
| Anterior papillary muscle |
| 19
.
| Right ventricle |
