Intervenous tubercle
Encyclopedia
The intervenous tubercle (tubercle of Lower) is a small projection on the posterior wall of the right atrium, above the fossa ovalis
Fossa ovalis (heart)
Found in the right atrium of the heart, the fossa ovalis is an embryonic remnant of the foramen ovale, which normally closes shortly after birth.In a heart specimen of a neonate, the fossa ovalis is translucent, but later in life the membrane thickens...

.

It is distinct in the hearts of quadrupeds, but in man is scarcely visible.

It was supposed by Lower to direct the blood from the superior vena cava
Superior vena cava
The superior vena cava is truly superior, a large diameter, yet short, vein that carries deoxygenated blood from the upper half of the body to the heart's right atrium...

 toward the atrioventricular opening.

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