The pulmonary vein is a vein that transfers oxygenated blood from the lungs to the heart. The largest pulmonary vein is the four major pulmonary veins, two of each lung that flows into the left atrium of the heart. The pulmonary vein is part of the pulmonary circulation.
Video Pulmonary vein
Structure
Two main pulmonary veins arise from each of the lung hilum, receiving blood from three or four bronchial veins each and flowing into the left atrium. The inferior and superior primary veins drain each lung, so there are four main veins in total.
At the root of the lung, the right superior pulmonary vein lies ahead and slightly below the pulmonary artery; inferior is located in the hilum pulmonary region. Behind the pulmonary artery is the bronchi. The right main pulmonary vein (containing oxygenated blood) passes behind the right atrium and superior cava vein; left in front of the descending aortic thoracic.
Variations
Sometimes three venous veins on the right side remain separate, and not infrequently both left lobe veins are terminated by a general opening to the left atrium. Therefore, the number of pulmonary veins that open to the left atrium can vary between three and five in a healthy population.
Two left-edged blood vessels can be combined as a single pulmonary vein at about 25% of people; Two correct veins can be united in about 3%.
Maps Pulmonary vein
Function
The pulmonary vein plays an important role in respiration, by receiving oxygenated blood in the alveoli and returning it to the left atrium.
Clinical interests
As part of the lung circulation they carry oxygenated blood back to the heart, in contrast to the systemic circulatory veins that carry deoxygenated blood.
A rare genetic deficiency of the pulmonary vein can cause them to flow into the pulmonary circulation in whole or in part, this is known as total anomalous pulmonary vein connections, or partial lung relations anomalies, respectively.
Additional images
See also
References
This article combines text in the public domain of page 642 of the 20th edition of Gray's Anatomy (1918)
External links
- Anatomical figure: 19: 05-08 in Human Anatomy Online, SUNY Downstate Medical Center
- Illustrations in infomat.net
Source of the article : Wikipedia
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