What are the two membrane layers of the pleurae called?

The two membrane layers of the pleurae are referred to as the visceral pleura and the parietal pleura. The visceral pleura is the layer that closely adheres to the lung surface, covering it directly. It plays a crucial role in protecting the lungs and facilitating their movement during respiration. The parietal pleura, on the other hand, lines the thoracic cavity and is attached to the chest wall and diaphragm. This structure allows for the creation of a pleural cavity, which contains pleural fluid that reduces friction and helps maintain negative pressure, essential for lung expansion and contraction during breathing.

Understanding these two layers is vital for grasping respiratory mechanics and the implications of pleural conditions, such as pleurisy or pleural effusion, which can affect lung function and overall respiratory health. The other terms presented do not accurately describe the layers of the pleurae and relate to different anatomical structures or contexts.