Final answer:
The most likely occluded coronary artery in a patient with an acute myocardial infarction of the septal wall is the left main coronary artery.
Step-by-step explanation:
If a patient experiences an acute myocardial infarction of the septal wall, the most likely occluded coronary artery is the left main coronary artery. The left main coronary artery supplies blood to the left side of the heart, including the interventricular septum. When it becomes occluded, it can lead to a heart attack and damage the heart muscle. In this case, if the patient is experiencing chest pain, prompt medical attention is necessary to address the blockage and prevent further complications.