In human anatomy, the bronchial arteries help supply the lungs with oxygenated blood. Although there is much variation, there are usually two bronchial arteries that run to the left lung, and one to the right lung.
The left bronchial arteries usually arise directly from the thoracic aorta.
The single right bronchial artery usually arises from one of the following:
- 1) the thoracic aorta at a common trunk with the right 3rd posterior intercostal artery
- 2) the superior bronchial artery on the left side
Distribution to lung
The bronchial arteries supply blood to the bronchi and connective tissue of the lungs. They travel with and branch with the bronchi, ending about at the level of the repiratory bronchioles. They anastomose with the branches of the pulmonary arteries, and together, they supply the visceral pleura of the lung in the process.
Comparison with pulmonary arteries
It is easy to confuse the bronchial arteries with the pulmonary arteries, because they both supply the lungs with blood, but there are important differences:
|pulmonary arteries||supplies deoxygenated blood pumped from the right ventricle||pulmonary circulation||relatively large|
|bronchial arteries||supplies oxygenated blood pumped from the left ventricle||systemic circulation||relatively small|
- Kauczor H, Schwickert H, Mayer E, Schweden F, Schild H, Thelen M. "Spiral CT of bronchial arteries in chronic thromboembolism". J Comput Assist Tomogr. 18 (6): 855–61. PMID 7962789.
- Template:SUNYAnatomyFigs - "Branches of the ascending aorta, arch of the aorta, and the descending aorta."
- Histology image: 13903loa – Histology Learning System at Boston University
- Bronchial arteries - anatquest.nlm.nih.gov.