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Other Terms: Pulmonary arterial subtree, Pulmonary arterial tree organ part
The right pulmonary artery is the longer branch off of the pulmonary trunk. It passes directly lateral under the aortic arch and posterior to the ascending aorta and the superior vena cava to the root of the right lung. There it divides into a large upper branch to the upper lobe of the lung, which gives off a branch to the middle lobe, and a smaller lower branch to the lower lobe. The right pulmonary artery is in relation anteriorly with the ascending aorta, the superior vena cava, the phrenic nerve, the anterior pulmonary plexus, and the pleura. Posteriorly, it is in relation with the right bronchus; above, with the aortic arch, and below, with the left atrium and the pulmonary veins. At the root of the lung the right bronchus is above and posterior, and the pulmonary veins below and anterior to the right pulmonary artery. These branches run the same course as the bronchi and are distributed to the lung tissue. Their terminal branches do not anastomose.