2 sets of arteries provide the lungs , viz.

A. Bronchial arteries.

B. Pulmonary arteries.

Bronchial Arteries.

Nourishment to the bronchial tree and pulmonary tissue are provided by the the bronchial arteries.

1 bronchial artery provides the right lung, which originates from the right third posterior intercostal artery or from upper left bronchial artery. 2 bronchial arteries provides the left lung, which originate from descending thoracic aorta.

Pulmonary Arteries.

The pulmonary arteries provide deoxygenated blood to the lungs. There’s 1 pulmonary artery for every lung. They may be the branches of the pulmonary trunk.

The left and right pulmonary arteries be located anterior to the main (primary) bronchi as they goes into the hilum of their respective lungs. The right pulmonary artery is crossed superiorly by the arch of the azygos vein; on the other hand the left pulmonary artery is located inferior to the arch of aorta, in the level of T5 vertebra. The pulmonary arteries split into lobar branches in the hilum and afterwards split into terminal/ segmental branches. The segmental branches, branch successively corresponding with the segmental branches of the bronchial tree.