The root of the lung (pulmonary root) is a short and broad stalk formed by a collection of structures that enter and leave each lung. These structures connect the lung to the heart, trachea and other surrounding tissues. The pulmonary root includes the following:

Main (principal) bronchi and lobar bronchi
Pulmonary artery
Superior and inferior pulmonary veins
Bronchial arteries (one on the right side and two on the left)
Bronchial veins
Anterior pulmonary nerve plexus and posterior pulmonary nerve plexus
Lymphatic vessels and bronchopulmonary lymph nodes
Loose connective tissue

The sequence of structures within the pulmonary roots is different for both lungs. In the right lung, it corresponds to the abbreviation BAV (Bronchus, Artery, Veins). The right main (principal) bronchus is located most superiorly, the right pulmonary artery is in the middle, and the pulmonary veins are the most inferior structures within the root of the right lung. In the left lung, the sequence of structures corresponds to the abbreviation ABV.

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Root of lungs