Each lung is an individual organ containing the branching elements of one side of the respiratory tree, the connected alveoli, and the corresponding pulmonary NAVL.
Located in the middle of the thorax, between the two pleural cavities, is the mediastinum ("I stand between").
The lungs are located within individual serous cavities, called the pleural cavities. Each lung is intimately covered with a serous membrane, the visceral pleura. The outer wall of the pleural cavity is lined with another serous membrane known as the parietal pleura. The mediastinal pleura forms the lateral wall of the mediastinum.
The diaphragmatic pleura covers the superior surface of the diaphragm.
The costal pleura lines the inner surface of the rib cage.
The cupolar pleura is a dome-like extension into the root of the neck. It contains the apex of the lung.The slit-like cavity between the diaphragmatic pleura and the lower costal pleura is called the costophrenic sinus.
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