Final answer:
The anterior or sternocostal surface of the heart is made up by the right ventricle, which is connected to the right atrium by the tricuspid valve, supported by chordae tendineae.
Step-by-step explanation:
The anterior or sternocostal surface of the heart is primarily made up by the right ventricle. This chamber of the heart receives blood from the right atrium through the tricuspid valve. The connection is strengthened by the chordae tendineae, which link the valve flaps to the papillary muscles anchored in the ventricle.
The right ventricle is significant in the heart's anatomy and plays a crucial role in pumping deoxygenated blood to the lungs through the pulmonary artery.