What is the head vessel that branches off the aorta from right to left?

The head vessel that branches off the aorta from right to left is known as the brachiocephalic trunk. This major artery arises from the aortic arch and is responsible for supplying blood to the right arm and the head and neck. It bifurcates into the right common carotid artery and the right subclavian artery. The brachiocephalic trunk is significant as it is the first branch of the aortic arch, highlighting its role in distributing blood from the heart to critical areas of the upper body.

The left common carotid and left subclavian arteries branch directly from the aortic arch, but they do so independently of the brachiocephalic trunk. The aortic arch itself is the section of the aorta that gives rise to these vessels, but it does not qualify as a "head vessel" in the same way the brachiocephalic trunk does. Therefore, the brachiocephalic trunk is the correct answer as the head vessel that provides blood supply from the aorta.