Each of a pair of serous membranes lining the thorax and enveloping the lungs
They help your lungs expand smoothly without sticking to the inside of your chest.
Pleurodiaphragmatic adhesion is a condition where the lining of the lung (pleura) becomes fused or stuck to the diaphragm, a muscle separating the chest and abdominal cavities. This can occur due to inflammation, infection, trauma, or underlying lung diseases. It can restrict normal lung movement and lead to breathing difficulties.
The membrane that protects the heart is called the pericardium. It has two layers: - the visceral pericardium (the inner layer which touches the heart) - the parietal pericardium (the outer layer which touches other organs)
The lungs are covered by a thin, double-layered membrane called the pleura. The inner layer (visceral pleura) covers the lungs themselves, while the outer layer (parietal pleura) lines the chest cavity. This arrangement creates a seal that allows the lungs to expand and contract during breathing.
The lungs are the essential organs of respiration; they are two in number, placed one on either side within the thorax, and separated from each other by the heart and other contents of the mediastinum (Fig. 970). The substance of the lung is of a light, porous, spongy texture; it floats in water, and crepitates when handled, owing to the presence of air in the alveoli; it is also highly elastic; hence the retracted state of these organs when they are removed from the closed cavity of the thorax. The surface is smooth, shining, and marked out into numerous polyhedral areas, indicating the lobules of the organ: each of these areas is crossed by numerous lighter lines. 1