What does the pleura consist of?

The pleura is indeed a double-layered membrane that envelops the lungs and lines the thoracic cavity. This structure consists of two main layers: the visceral pleura, which is attached directly to the surface of the lungs, and the parietal pleura, which lines the chest wall and diaphragm. The space between these two layers is known as the pleural cavity, which contains pleural fluid that reduces friction during breathing and helps maintain pressure within the lungs.

Understanding the function of the pleura is crucial in the context of respiratory health, as any issues with the pleural membranes, such as pleuritis or pleural effusion, can severely impact lung function. The double-layered nature of the pleura provides both protection and support, playing a significant role in the mechanics of breathing.