Hilum of lung

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Hilum of left lung
Illu quiz lung04.jpg
1. Oblique fissure
2. Vertebral part
3. Hilum of lung
4. Cardiac impression
5. Diaphragmatic surface
Latin hilum pulmonis
Gray's p.1095

Above and behind the cardiac impression on the lung is a hilum, a triangular depression named the hilum of lung, where the structures which form the root of the lung enter and leave the organ. These include the pulmonary artery, superiormost on the left lung, the superior and inferior pulmonary veins, lymphatic vessels and the bronchus, with bronchial veins and bronchial arteries surrounding it. The pulmonary ligament droops down from the hilum of the lung and terminates in a free, or falciform, edge.

The rib cage is separated from the lung by a two layered membranous coating, called a pleura. The hilum represents the point where the parietal pleura (covering the rib cage) and the visceral pleura (covering the lung) connect. The hilum is where the connection between the mediastinum and the pleural cavities meet.

The area around the hilum is called "perihilar".

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This article incorporates text from a public domain edition of Gray's Anatomy.