Venous blood, gathering from all the organs of the body enters the right side of the heart through two large venous trunks: the superior vena cava and inferior vena cava, which fit all the vessels, forming a system of hollow veins. Bypassing the upper and lower hollow vein into the right atrium only get their own vein of the heart.
a., aa. — arteria, arteriae (artery, the artery)
lig., ligg. — ligamentum, ligamenta (ligament, the ligaments)
m., mm. — musculus, musculi (muscle, the muscle)
n., nn. — nervus, nervi (nerve, the nerve)
r., rr. — ramus, rami (branch)
s. — seu (or)
v., vv. — vena, venae (vienna)