vein pulmonary vein https://upload.wikimedia.org/wikipedia/commons/d/db/Alveoli_diagram.png AAO:0010521 Any of the veins which collect blood from the lungs and some small vesicles received from the esophagus.[AAO] GAID:543 Pulmonary veins are blood vessels that transport blood from the lungs to the heart[GO]. On the other hand, in the sister clade of the actinopterygians, the sarcopterygians, the gill circulation is supplemented with lung ventilation. As a result, the pulmonary artery and vein and a functional ductus arteriosus arose as a major evolutionary innovation from the sixth arch, giving the organism a flexible shunt to balance blood supply to and from gills and lungs according to environmental conditions.[well established][VHOG] MESH:D011667 XAO:0000394 FMA:66643 uberon EMAPA:18645 VHOG:0001133 BTO:0001799 UMLS:C0034090 the veins that return oxygenated blood from the lungs to the left atrium of the heart NCIT:C12776 EHDAA2:0001579 pulmonary venous tree organ part CALOHA:TS-0840 MA:0002206 One of two pairs of large vessels that return oxygenated blood from each lung to the left atrium of the heart. [TFD][VHOG] UBERON:0002016 EHDAA:2629 galen:PulmonaryVein venae pulmonales structure with developmental contribution from neural crest great vessel of heart