Superior vena cava
The superior vena cava is a vein in the body that carries deoxygenated blood to the right atrium of the heart, and it is also commonly referred to as the precava. This vein is short in length; however, it is very wide in diameter. The right and left brachiocephalic veins form this vein. All of these veins receive blood from the upper body, such as the arms, neck, and the head. Before going into the right atrium of the heart, the precava will join with the azygous vein, and the azygous vein receives its blood supply from the rib cage. These veins are bringing the blood into the heart so that it can pulsate and pump. The superior vena cava does not have any valves separating it from the right atrium of the heart, and this allows the blood to flow into the right atrium and ventricle of the heart to cause it to contract. This forces blood to flow up through the internal jugular vein and will result in jugular venous pressure.
Written and medically reviewed by the Healthline Editorial Team
In Depth: Superior vena cava