11. A less common ring is present with a right aortic arch instead of the usual left-sided aortic arch. 12. Type 1 encompasses dissection in the distal ascending aorta closest to the heart, not including the aortic arch . 13. The aortic arch has three major branches : from left common carotid artery, and the left subclavian artery. 14. With the use of barium esophagography it became possible to diagnose aortic arch anomalies during life in the 1930s. 15. The prechordal mesenchyme proliferates laterally over the junction of the dorsal aorta and first aortic arch on each side. 16. I do know what metastasis is, and that the blood goes to the brain directly from the aortic arch . 17. The aortic arch is transected and the stent graft device is delivered in an ante-grade fashion in the descending aorta. 18. In the Western world, atherosclerosis is a more frequent cause of obstruction of the aortic arch vessels than Takayasu's arteritis. 19. In suitable fetuses, marked increases in aortic arch dimensions have been observed over treatment periods of about two to three weeks. 20. Meanwhile, baroreceptors in the aortic arch detect the increase in blood pressure and trigger a parasympathetic response via the Vagus nerve.