Aortic arch
The arch of the aorta begins at the level of the upper border of the second sternocostal articulation of the right side, and runs at first upward, backward, and to the left in front of the trachea; ...
The Aortic Arches."The first and second arches disappear early, but the dorsal end of the second gives origin to the stapedial artery (Fig. 474), a vessel which atrophies in man but persists in some mammals.
Red blood is moved anteriorly by a dorsal blood vessel and pumped by five pairs of hearts (sometimes referred to as aortic arches) to a ventral vessel.
aortic arch - brachiocephalic (thyreoidea ima) - common carotid
Subclavian
internal thoracic: anterior intercostal - thymic - pericardiacophrenic - terminal (musculophrenic, superior epigastric) ...
Hearts have a variety of forms: chambered hearts in mollusks and vertebrates, tubular hearts of arthropods, and aortic arches of annelids. Accessory hearts are used by insects to boost or supplement the main heart's actions.
deoxygenated blood from the right atrium is sent, relatively pure, to the pulmocutaneous arteries taking blood to the skin and lungs where fresh oxygen can be picked up.
Only the blood passing into the aortic arches has been thoroughly mixed, ...
 See also: Human, Arteries, Vessels, Trans, Aorta
  
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