Space
Pleural cavity
Fluid-lined interval around each lung
High-yield
The two cavities normally have no connection. Lung expansion depends on the pressure difference across the lung; pleural pressure is not negative under every breathing condition.
Overview
The pleural cavity is the narrow interval between visceral and parietal pleura. A small amount of fluid lets the surfaces slide while transmitting forces between the lung and chest wall.
Reference facts
- Boundaries
- Between the lung’s visceral pleura and the parietal lining of the chest wall, mediastinum and diaphragm
- Contents
- A thin fluid film under normal conditions
- Communications
- Normally closed to the atmosphere and opposite cavity; continuous with its own pleural recesses
Clinical correlation
Pneumothorax places air in this space. When expanding air causes tension physiology, breathing and circulation can deteriorate rapidly; neck-vein distension or obvious mediastinal shift need not be present.
Frequently asked questions
What are the boundaries of the pleural cavity?
Between the lung’s visceral pleura and the parietal lining of the chest wall, mediastinum and diaphragm.
What does the pleural cavity contain?
A thin fluid film under normal conditions.
What does the pleural cavity communicate with?
Normally closed to the atmosphere and opposite cavity; continuous with its own pleural recesses.