Which of the following supplies blood to the infundibulum of the right ventricle?

The infundibulum of the right ventricle, also known as the conus arteriosus, is the outflow tract leading to the pulmonary artery. The conus artery is specifically responsible for supplying blood to this region. It branches off from the right coronary artery in most individuals, providing the necessary blood supply to this critical area where the right ventricle pumps deoxygenated blood into the pulmonary circulation.

Understanding the anatomy of the heart is essential for appreciating the role of various arteries. The conus artery's primary function is to ensure that the infundibulum has an adequate blood supply to support its function in the cardiac cycle. This is crucial for maintaining proper right ventricular output and subsequently the efficiency of pulmonary circulation.

In contrast, while the acute marginal artery supplies the right ventricle and the PDA (posterior descending artery) serves the inferior part of the heart, they do not directly supply the infundibulum. The SA node artery is primarily responsible for supplying blood to the sinoatrial node, influencing heart rhythm, and is not involved in supplying the infundibulum. Thus, the conus artery is the most appropriate choice concerning the blood supply to the infundibulum of the right ventricle.