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A plenum space is a part of a building that can facilitate air circulation for heating and air conditioning systems, by providing pathways for either heated/conditioned or return airflows, usually at greater than atmospheric pressure.
The pleura is a two layered sac that holds the lungs and separates them from the chest wall, diaphragm, and heart. Pleurisy results from an inflammation of this sac. The pleura that lines the inside of the chest is called the parietal pleura. The pleura that covers the lungs is called the visceral pleura. If you are healthy, the pleura is separated by a thin layer of fluid.