Bronchial artery labeled at center right
|Latin||Arteriae bronchiales, |
rami bronchiales partis thoracicae aortae
|FMA||68109 71536, 68109|
In human anatomy, the bronchial arteries supply the lungs with nutrition and 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 single right bronchial artery usually arises from one of the following:
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 respiratory bronchioles. They anastomose with the branches of the pulmonary arteries, and together, they supply the visceral pleura of the lung in the process.
Note that much of the oxygenated blood supplied by the bronchial arteries is returned via the pulmonary veins rather than the bronchial veins. As a consequence, blood returning to the left heart is slightly less oxygenated than blood found at the level of the pulmonary capillary beds.
Each bronchial artery also has a branch that supplies the esophagus.
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|
With modern surgical techniques, bronchial anastomoses heal well without bronchial artery reconnection. Largely for this reason, bronchial artery circulation is usually sacrificed during lung transplants, instead relying on the persistence of a microcirculation (presumably arising from the deoxygenated pulmonary circulation) to provide perfusion to the airways.
The bronchial arteries and their supply of nutrients to the lungs are also attributed to the observation that an occluded (either ligated or by an embolus) pulmonal artery very rarely results in lung infarction. The bronchial arteries can maintain a supply of oxygenated blood to lung tissue.
Vital volume is 4600ml
Residual volume is 1200ml