What is the primary characteristic of the parietal pleura?

The primary characteristic of the parietal pleura is that it lines the inside of the rib cage. This membrane is a crucial component of the pleural cavity, which is the space between the two pleurae (the parietal pleura and the visceral pleura). The parietal pleura attaches to the thoracic wall, diaphragm, and mediastinum, providing important support and structure to the thoracic cavity. Its role in facilitating the movement of the lungs during respiration is also significant, as it creates a sealed environment that allows for the pressure changes necessary for inhalation and exhalation.

In contrast, the visceral pleura is the layer that directly covers the lungs themselves, while the abdominal organs are not covered by the pleura but rather by the peritoneum. The inner layer of the pleura refers to the visceral pleura, which is distinct from the parietal pleura that lines the rib cage. Understanding the specific locations and roles of the parietal and visceral pleurae is essential for grasping the anatomy of the thoracic cavity.