„The pleural membrane is a double-layered serous membrane that encloses and protects the lungs. The outer layer is attached to the wall of the thoracic cavity and diaphragm and is called parietal pleura. The inner layer, the visceral pleura, is attached to the lungs. Between the visceral and parietal pleurae is a narrow space, the pleural cavity, which contains a lubricating fluid secreted by the membranes.“ Introduction to the human body, 7th edition, bls. 451 Ef rifbeinið stingst í lungað...