<unk> es (or<unk> s) are<unk> es that develop to supply blood to the lungs when native pulmonary circulation is underdeveloped. Instead of coming from the pulmonary trunk, supply develops from the aorta and other systemic<unk> es.
Major aortopulmonary collateral artery
Caliber persistent artery
Subclavian loop
Preureteric vena cava
Arterial tree
Necklace of Venus
Cardiopulmonary nerves
Portal vein