intervenous tubercle intervenous tubercle the intervenous tubercle (tubercle of lower) is a small projection on the posterior wall of the right atrium, above the fossa ovalis. intervenous tubercledetailsidentifierslatintuberculum intervenosumta98a12.1.01.014fma9270anatomical terminology 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 toward the atrioventricular opening.