The Four Major Vessels of the Heart: Anatomy & Function

The heart's four great vessels are the primary highways for blood flow into and out of the heart. They are:

1. Aorta: The largest artery in the body. It carries oxygen-rich blood from the left ventricle to the systemic circulation.
2. Pulmonary Artery: Carries deoxygenated blood from the right ventricle to the lungs for oxygenation. It is the only artery that carries deoxygenated blood.
3. Pulmonary Veins: Typically four veins that carry oxygenated blood from the lungs to the left atrium. They are the only veins that carry oxygenated blood.
4. Superior and Inferior Vena Cava: The two largest veins. The superior vena cava returns deoxygenated blood from the upper body (head, neck, arms) to the right atrium. The inferior vena cava returns deoxygenated blood from the lower body to the right atrium.

Understanding these vessels is fundamental to cardiac anatomy and the pathophysiology of heart disease.