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Pharyngeal arches

The first,second, and fifth aortic arches completely regress, leaving no structures or vestiges in the adult. The third aortic arch forms the common and proximal internal carotid arteries. 

The fourth aortic arch gives rise to part of the true aortic arch and a position of the subclavian arteries. The sixth aortic arch gives rise to the pulmonary arteries and the ductus arteriosus.