First 2 arches form maxillary, hyoid, and stapedial arteries. 2nd pair forms carotid arteries. 3rd pair leaves aortic sac and forms right and left horns, the right horn becomes the brachiocephalic trunk and the left horn along with the 4th aortic arch becomes the arch of the aorta. As ascending aorta leaves pericardium it divides into right and left aortic arch that join to form descending aorta. Left arch passes anteriorly and to the left of trachea and the right aortic arch passes to the right and posterior of esophagus.
Right arch becomes right common carotid and right subclavian.
Left arch becomes left common carotid and left subclavian. Left arch is interrupted proximally to ductus arteriosus. Interruption may also occur between left common carotid and right arch. This is common in tetralogy of fallot and truncus arteriosus . Left arch can also cross behind esophagus and form a ring in combination with right patent ductus arteriosus or ligamentum arteriosus.