How many surfaces does human heart have?

The human heart has five anatomical surfaces: sternocostal (anterior), diaphragmatic (inferior), base (posterior), and right and left pulmonary surfaces. The **sternocostal surface** is mainly formed by the right ventricle and lies behind the sternum. The **diaphragmatic surface** rests on the diaphragm and is mostly formed by the left and partly the right ventricle. The **base** or posterior surface is primarily composed of the left atrium. The **right pulmonary surface** is formed by the right atrium, while the **left pulmonary surface** is formed by the left ventricle. These surfaces are important in imaging, surgical access, and clinical diagnosis.