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Laboratory 20. Heart
Step 14. Openings of Vessels into the Right Atrium

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Identify the openings of the superior vena cava [probe] and inferior vena cava [probe]. At the opening of the inferior vena cava, locate the nonfunctional remnant of the valve of the inferior vena cava [cross-section]. On the posterior wall of the right atrium just superior to the opening of the inferior vena cava, locate also the ostium of the coronary sinus [cross-section ]. This opening is guarded by a small triangular-shaped valve called the valve of the coronary sinus [cross-section ].

Links and References:
Grant's: 1.63
Netter: 208
Rohen/Yokochi: 240