The Diaphragmatic Surface of the heart refers to which portion that rests against the diaphragm?

• A. Anterior surface of the heart
• B. Posterior surface of the heart
• C. Diaphragmatic Surface of the heart
• D. Lateral surface of the heart

Answer: (C)

Understanding heart surfaces helps you map how the heart sits in the chest. The diaphragmatic surface is the bottom, inferior part of the heart that rests directly on the diaphragm. It’s mainly formed by the left ventricle, with some contribution from the right ventricle, and it faces downward toward the diaphragm and posteriorly toward the vertebral column. So when a question asks which portion rests against the diaphragm, the diaphragmatic surface is the correct one to identify. The other surfaces aren’t in contact with the diaphragm: the anterior surface faces the sternum, the posterior surface lies toward the spine, and the lateral surfaces sit toward the lungs.