Now at this particular intersection point, we see that the left subclavian artery actually branches. So it branches and informs this artery, known as the left vertebral artery, that goes to our head portion of the body. It also extends many times, it permeates many times within our shoulder and arm portion as shown. And that is to ensure that all the blood gets to the cells of our left shoulder and our left arm. Now what about the middle branching point on the arch? This right here labeled as two B, is known as our left common carotid artery.