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The portion of the pleura seen as the outer layer covers the chest wall, the diaphragm and the mediastinum and is often also misleadingly called the parietal pleura. A correct anatomical nomenclature refrains from using the ambiguous terms visceral and parietal in favour of a 4-portion system based on the structures the pleura covers: pulmonary ...
The serous membrane that covers the surface of the lung is the visceral pleura and is separated from the outer membrane, the parietal pleura, by just the film of pleural fluid in the pleural cavity. The visceral pleura follows the fissures of the lung and the root of the lung structures. The parietal pleura is attached to the mediastinum, the ...
Serous membranes have two layers. The parietal layers of the membranes line the walls of the body cavity (pariet- refers to a cavity wall). The visceral layer of the membrane covers the organs (the viscera). Between the parietal and visceral layers is a very thin, fluid-filled serous space, or cavity. [4]
The pleural space, between the visceral and parietal pleura of the lung, is a potential space. [1] Though it only contains a small amount of fluid normally, it can sometimes accumulate fluid or air that widens the space. [ 2 ]
A pleural effusion appears as an area of whiteness on a standard posteroanterior chest X-ray. [14] Normally, the space between the visceral pleura and the parietal pleura cannot be seen. A pleural effusion infiltrates the space between these layers. Because the pleural effusion has a density similar to water, it can be seen on radiographs.
The thoracic cavity is the space that includes the pleura, lungs, and heart, while the pleural space is only the space between the parietal pleura and visceral pleura surrounding lungs. Intrapleural pressure depends on the ventilation phase, atmospheric pressure, and the volume of the intrapleural cavity.
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The visceral-parietal reflection surrounding the root of the lung extends downwards from the hilum to near the base of the lower lobe in a sleeve-like fold called the pulmonary ligament. The lower rounded edge of this is sometimes referred to as the inferior pulmonary ligament. At the lower edge of each lung, the pleural layers come into ...