<Tr> <Th> FMA </Th> <Td> 3768 </Td> </Tr> <Tr> <Td_colspan="2"> Anatomical terminology (edit on Wikidata) </Td> </Tr> <P> The aortic arch, arch of the aorta, or transverse aortic arch (English: / eɪ ˈɔːrtɪk /) is the part of the aorta between the ascending and descending aorta . The arch travels backward, so that it ultimately runs to the left of the trachea . </P> <P> At the cellular level, the aorta and the aortic arch are composed of three layers: The tunica intima, which surrounds the lumen and is composed of simple squamal epithelial cells; the tunica media, composed of smooth cell muscles and elastic fibers; and, the tunica adventitia, composed of loose collagen fibers . Innervated by barometric nerve terminals, the aortic arch is responsible for sensing changes in the dilation of the vascular walls, inducing changes in heart rate to compensate for changes in blood pressure . </P>

Where does the aortic arch start and stop