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Deoxygenated blood enters the right atrium through three major veins: the superior and inferior vena cava and the coronary sinus. The superior vena cava returns all of the blood to the heart from tissues superior to the heart in the head, neck, arms and upper thorax. Likewise, the inferior vena cava returns blood to the heart from tissues inferior to the heart, including the legs, abdomen and lower thorax.
Inferior Vena Cava. Inferior vena cava is the largest vein in the body, which carries deoxygenated blood from the lower half of the body into the right atrium of the heart. It is located posterior to the abdominal cavity and runs to the heart next to the abdominal aorta.uperior Vena Cava. Superior vena cava is a large vein which brings deoxygenated blood into the right atrium of the heart from the upper half of the body, including neck, head and upper limbs. It begins above the heart.