Flags of sovereign nations should not be flown on the same pole as the United States Flag but from separate poles. The United Nations Headquarters Building in New York City, where the U.N. Flag holds the most prominent position, is the only U.S. location exempted from this provision.
Inferior vena cava. The inferior vena cava (or IVC) (Latin: vena, vein, cavus, hollow) is a large vein that carries deoxygenated blood from the lower and middle body into the right atrium of the heart. Its walls are rigid and has valves so the blood does not flow down via gravity.
vena caÂ´va the inferior vena cava and superior vena cava considered as a unit. See Appendix 2-6. inferior vena cava the venous trunk for the lower extremities and the pelvic and abdominal viscera; it empties into the right atrium of the heart. See Appendix 2-6. superior vena cava the venous trunk draining blood from the head, neck, upper extremities, and chest; it empties into the right atrium of the heart.