A pulmonary artery is an artery in the pulmonary circulation that carries deoxygenated blood from the right side of the heart to the lungs. The largest pulmonary artery is the main pulmonary artery or pulmonary trunk from the heart, and the smallest ones are the arterioles which lead to the capillaries that surround the pulmonary alveoli.
Video Pulmonary artery
Pulmonary arterial tree
In order of blood flow, the pulmonary arteries start as the pulmonary trunk or main pulmonary artery. The main pulmonary artery begins at the base of the right ventricle. It is short and wide--approximately 5 centimetres (2.0 in) in length and 3 centimetres (1.2 in) in diameter.
The main pulmonary artery splits into the right and the left main pulmonary artery. The left main pulmonary artery is shorter and somewhat smaller than the right, passes horizontally in front of the descending aorta and left bronchus to the root of the left lung. Above, the left main pulmonary artery is connected to the concavity of the proximal descending aorta by the ligamentum arteriosum. It then divides into two lobar arteries, one for each lobe of the left lung. The right main pulmonary artery follows a longer and more horizontal course as it crosses the mediastinum. It passes underneath the aortic arch, behind the ascending aorta, and in front of the descending aorta. It courses posterior to the superior vena cava and in front of the right bronchus. Upon reaching the hilum of the right lung the right main pulmonary artery divides into two branches:
- truncus anterior -- supplies blood to the right upper lobe.
- interlobar artery -- inferior and larger branch, supplies blood to the middle and inferior lobes of the lung.
The right and left main pulmonary arteries give off branches that roughly correspond to the lung lobes, and can in such cases be termed lobar arteries. The lobar arteries branch into segmental arteries (roughly 1 for each lobe segment), which in turn branch into subsegmental pulmonary arteries. These eventually form intralobular arteries.
Maps Pulmonary artery
Development
The pulmonary arteries originate from the truncus arteriosus and the sixth pharyngeal arch. The truncus arteriosis is a structure that forms during the development of the heart as a successor to the conus arteriosus.
By the third week of development, the endocardial tubes have developed a swelling in the part closest to the heart. The swelling is known as the bulbus cordis and the upper part of this swelling develops into the truncus arteriosus The structure is ultimately mesodermal in origin. During development of the heart, the heart tissues undergo folding, and the truncus arteriosus is exposed to what will eventually be both the left and right ventricles. As a septum develops between the two ventricles of the heart, two bulges form on either side of the truncus arteriosus. These progressively enlarge until the trunk splits into the aorta and pulmonary arteries.
During early development, the ductus arteriosis connects the pulmonary trunk and the aortic arch, allowing blood to bypass the lungs.
Function
The pulmonary artery carries deoxygenated blood from the right ventricle to the lungs. The blood here passes through capillaries adjacent to alveoli and becomes oxygenated as part of the process of respiration.
In contrast to the pulmonary arteries, the bronchial arteries supply nutrition to the lungs themselves.
The pulmonary artery pressure (PA pressure) is a measure of the blood pressure found in the main pulmonary artery. This is measured by inserting a catheter into the main pulmonary artery. The mean pressure is typically 9 - 18 mmHg, and the wedge pressure measured in the left atrium may be 6-12mmHg. The wedge pressure may be elevated in left heart failure, mitral valve stenosis, and other conditions, such as sickle cell disease.
Clinical significance
The pulmonary artery is relevant in a number of clinical states. Pulmonary hypertension is used to describe an increase in the pressure of the pulmonary artery, and may be defined as a mean pulmonary artery pressure of greater than 25mmHg. As can be measured on a CT scan, a diameter of more than 29 mm diameter is often used as a cut-off to indicate pulmonary hypertension. This may occur as a result of heart problems such as heart failure, lung or airway disease such as COPD or scleroderma, or thromboembolic disease such as pulmonary embolism or emboli seen in sickle cell anaemia.
Pulmonary embolism refers to an embolus that lodges in the pulmonary circulation. This may arise from a deep venous thrombosis, especially after a period of immobility. A pulmonary embolus is a common cause of death in patients with cancer and stroke. A large pulmonary embolus which becomes lodged in the bifurcation of the pulmonary trunk with extensions into both the left and right main pulmonary arteries is called a saddle embolus.
Additional images
See also
- Pulmonary artery sling
- Rasmussen's aneurysm
References
- Schoenwolf ... [et al.], Gary C. (2009). Larsen's human embryology (4th ed., Thoroughly rev. and updated. ed.). Philadelphia: Churchill Livingstone/Elsevier. pp. "Development of the Urogenital system". ISBN 9780443068119.
External links
- Anatomy photo:20:01-0106 at the SUNY Downstate Medical Center - "Heart: The Pericardial sac and Great vessels"
- Anatomy photo:20:07-0105 at the SUNY Downstate Medical Center - "Heart: Openings of Great Vessels into the Pericardial Sac"
- Anatomy figure: 19:05-06 at Human Anatomy Online, SUNY Downstate Medical Center - "Mediastinal surface of the right lung"
- Anatomy figure: 19:06-02 at Human Anatomy Online, SUNY Downstate Medical Center - "Mediastinal surface of the left lung"
- Histology image: 13802loa - Histology Learning System at Boston University
Source of the article : Wikipedia
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