Left pulmonary artery

The left pulmonary artery or left branch of the pulmonary artery, 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, where it divides into two branches. The lower of these goes to the lower lobe of the lung; the upper is distributed to the upper lobe.

Above, it is connected to the concavity of the proximal descending aorta by the ligamentum arteriosum, on the left of which is the left recurrent nerve, and on the right the superficial part of the cardiac plexus. Below, it is joined to the upper left pulmonary vein by the ligament of the left vena cava.