In human anatomy, the pleural cavity is a boy cavity containing the lungs; the lungs are surrounded by two serous membranes, the pleurae. The outer pleura (parietal pleura) covers and is attached to the chest wall. The inner pleura (visceral pleura) covers and is attached to the lung and other structures, i.e. blood vessels, bronchi and nerves. Between the two is a thin space known as the pleural space, which normally contains a small amount of pleural fluid.