Which layers make up the pleural cavity?

The layers that make up the pleural cavity are accurately described by the visceral layer, pleural fluid, and parietal layer.

The visceral layer, also known as the visceral pleura, is the inner membrane that tightly adheres to the surface of the lungs. This layer plays a crucial role in protecting the lung tissue and allowing the lungs to move freely during respiration.

The parietal layer, or parietal pleura, is the outer membrane that lines the thoracic cavity. It provides a protective layer and serves to anchor the lungs to the thoracic wall, preventing them from collapsing.

Between these two layers is pleural fluid, which fills the pleural space. This fluid acts as a lubricant, reducing friction between the lung surfaces and the thoracic wall during breathing. It also helps create surface tension, which assists in keeping the lungs inflated.

Understanding these components is essential for grasping how the pleural cavity functions in respiratory mechanics, particularly in facilitating lung expansion and contraction.