What is the order of the major vessels coming off the aortic arch from proximal to distal?

The major vessels that branch off the aortic arch, from proximal to distal, begin with the innominate artery (or brachiocephalic trunk), which is the first branch and supplies blood to the right arm and the head and neck. After the innominate artery, the next vessel to branch off is the left carotid artery, which supplies blood to the left side of the head and neck. Finally, the left subclavian artery branches off as the third vessel, supplying blood to the left arm.

This order of branching is crucial for understanding the anatomical layout of the aortic arch and its branches, especially when interpreting echocardiographic images or performing other cardiovascular assessments. Having knowledge of the correct sequence helps clinicians visualize the distribution of blood flow to various parts of the body and assess potential vascular issues.