The pleura consists of two layers: the inner (visceral) layer, which is next in the lungs and the outer (parietal) layer that lines the chest wall. The two layers of the pleura are usually in contact and push each other as we breathe. The membranes produce fluid, where they can slide over each other easily.
Where is developing mesothelioma of the pleura (pleural mesothelioma), the delicate membranes thicken and may press inwards on the lung. Fluid can also between two layers of the pleura, collect: This is called a pleural effusion.
Structure of the lungs and pleura
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