The intervenous tubercle (tubercle of Lower) is a small projection on the posterior wall of the

right atrium The atrium ( la, ātrium, , entry hall) is one of two upper chambers in the heart that receives blood from the circulatory system. The blood in the atria is pumped into the heart ventricles through the atrioventricular valves. There are two at ...

, above the fossa ovalis. It is distinct in the hearts of

quadrupeds Quadrupedalism is a form of locomotion where four limbs are used to bear weight and move around. An animal or machine that usually maintains a four-legged posture and moves using all four limbs is said to be a quadruped (from Latin ''quattuor' ...

, but in man is scarcely visible. It was supposed by Lower to direct the blood from the

superior vena cava The superior vena cava (SVC) is the superior of the two venae cavae, the great venous trunks that return deoxygenated blood from the systemic circulation to the right atrium of the heart. It is a large-diameter (24 mm) short length vein th ...

toward the atrioventricular opening.

References

External links

Photo at wsu.edu (vet)
Cardiac anatomy {{circulatory-stub