vena cava
(vee-na cah-va) [L. blood vessel + hollow]
A large vein that brings blood from the tissues to the right atrium of the four-chambered mammalian heart.
The vena caval foramen is the highest of the three, and is situated about the level of the fibrocartilage between the eighth and ninth thoracic vertebræ.
Superior vena cava SVC carries blood from head, upper chest and arms
Inferior vena cava IVC carries blood from lower chest, abdomen and legs ...
superior vena cava Blood from the head returns to the heart through this main vein.
The functional lobes are separated by a plane joining the gallbladder fossa to the inferior vena cava. This separates the liver into the true right and left lobes. The middle hepatic vein also demarcates the true right and left lobes.
Veins draining the upper portion of the body lead to the superior vena cava.
Veins draining the lower part of the body lead to the inferior vena cava.
Both empty into the right atrium.
Link to discussion of the control of the heartbeat.
inferior (posterior or ascending) vena cava carrying blood to the heart from posterior parts of the body; contrast to precaval vein
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby
...
The vena cavae are the main veins of the systemic circuit. Coronary arteries deliver oxygenated blood, food, etc. to the heart.
Collection of fluids begins at the capillaries of the circulatory system and then the fluid directed through a series of vessels that become the thoracic duct. That duct is connected to the largest vein in your body, the superior vena cava, ...
 See also: Human, Tissue, Arteries, Anatomy, Vessels
  
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