What is the primary function of the parietal pleura?

The primary function of the parietal pleura is to line the pleural cavity and is attached to the chest wall. This serous membrane forms a protective layer that encases the lungs and helps in reducing friction between the lungs and the thoracic cavity during respiration. By adhering to the chest wall, it also contributes to the negative pressure within the pleural cavity, which is crucial for lung expansion during inhalation.

The parietal pleura plays a vital role in the mechanics of breathing. As the chest expands, the parietal pleura moves with it, allowing the lung to expand in conjunction with the change in chest volume. This function is fundamental to the process of ventilation, enabling effective air movement in and out of the lungs. Understanding this anatomical relationship provides insight into respiratory physiology and the importance of pleural integrity in maintaining normal lung function.