the liver
Superior and inferior Vena Cava
There are four pulmonary veins and are large blood vessels that receive oxygenated blood from the lungs and drain into the left atrium of the heart.
There are no vessels that drain the right atrium, except, perhaps the coronary veins. The right atrium moves blood through the tricuspid valve into the right ventricle of the heart.
As far as know they are the Coronary Sinus, the Superior Vena Cava and the Inferior Vena Cava.
There are two main blood vessels into which all blood returning to the heart drains, the superior and inferior vena cava. The superior vena cava will drain blood from the upper part of the body into the right atrium and the inferior vena cava will drain blood from the lower part of the body into the right atrium.
Superior vena cavaInferior vena cavacoronary sinus
venule(veins)
The Aorta
Three vessels drain into the right atrium, the Ascending vena cava, the descending vena cava and the coronary sinus.
The frog heart has 3 chambers: two atria and a single ventricle. The atrium receives deoxygenated blood from the blood vessels (veins) that drain the various organs of the body. The left atrium receives oxygenated blood from the lungs and skin (which also serves as a gas exchange organin most amphibians). Their heart works the same way as human hearts.
Two pulmonary veins from the right lung and two pulmonary veins from the left lung.
Jugular Foreman