| Pleural Cavity |
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| respiratory system | |
The Lung s are surrounded by two Membrane s, the pleurae. The outer pleura is attached to the Chest Wall and is known as the Parietal Pleura ; the inner one is attached to the lung and other Viscera l tissues and is known as the Visceral Pleura . In between the two is an actual thin space known as the '''pleural cavity''' or '''pleural space'''. The parietal pleura is highly sensitive to pain; the visceral pleura is not. FUNCTIONS Pleural fluid serves several functions. It lubricates the pleural surfaces and allows the pleural layers to slide against each other easily during respiration. Pleural fluid also provides the surface tension that keeps the lung surface in close apposition with the chest wall. This allows optimal inflation of Alveoli during respiration. It also directly transmits pressures from the chest wall to the visceral pleural surface (and hence, the lung). Therefore, movements of the chest wall during breathing are coupled closely to movements of the BLOOD SUPPLY The visceral pleura has a dual Blood Supply from the Bronchial and Pulmonary Arteries . FLUID It is filled with pleural fluid, a Serous Fluid produced by the pleura. A normal 70 kg human has approximately 12-15 mL of pleural fluid. In normal pleurae, most fluid is produced by the parietal circulation ( Intercostal Arteries ) via Bulk Flow and reabsorbed by the Lymphatic System . Thus, pleural fluid is continuously produced and reabsorbed. The rate of reabsorption may increase up to 40x before significant amounts of fluid accumulate within the pleural space. In humans, there is no anatomical connection between the left and right pleural cavities, so in cases of pneumothorax (see below), the other hemithorax will still be able to function normally. DISEASES Diseases involving the pleura include:
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