BRONCHIAL ARTERIES

 The right bronchial artery usually (78% of people) arises within a common stem, with the first aortic intercostal (inter-costobronchial artery) from the posteromedial aspect of the descending aorta.

 On the left side, there is generally a superior and an inferior branch, both arising from the anterior aspect of the descending thoracic aorta.

The bronchial arteries run into the hilum, where they branch in a parallel manner and close to the bronchus to the peripheral airways.

 The diameters of these arteries are small, usually 1–1.5 mm at its origin within the mediastinum.