Each pulmonary hilum takes place on the medial and mediastinal portion of the lung to which it belongs; here, the pleura is in continuity with its two sheets (the visceral and the parietal) and flows into a structure called the pulmonary ligament.
In addition to ensuring the passage to the structures indicated above, the pulmonary hilum has the task of connecting each lung to the heart and trachea through an anatomical element called the pulmonary root.
In light of the fact that the aforementioned anatomical elements (bronchi, pulmonary arteries and veins, bronchial arteries and veins, etc.) are the components of the so-called pulmonary roots (or lung roots); The pulmonary hilum can also be defined as the point of connection between each lung and the corresponding pulmonary root.
The pulmonary hilum is an equal structure of the human body, as it is present, in a single copy, on each lung.
