What is Venae cavae?
[[Image:Relations of the aorta, trachea, esophagus and other heart structures.png|thumb|300px|The human heart and nearby structures, with ''superior'' and ''inferior vena cava'' labeled at left side of image.]] The '''superior vena cava''' is the large [[vein]] which returns [[blood]] to the [[heart]] from the [[head]], [[neck]] and both [[upper limb]]s. The '''inferior vena cava''' returns blood to the heart from the lower part of the body. The return of blood via the vena cava can be compromised and cause disease. For example, in the superior vena cava syndrome, the symptoms that result from compression of the large vein that carries blood down to the heart. {{biology-stub}} [[Category:Blood vessels]]