The thoracic surface of the diaphragm is covered by the diaphragmatic pleura. Below the lower border of the lung, the costal and diaphragmatic pleurae are in apposition to each other in quiet respiration. The margins of the base of the lung decline and the costal and diaphragmatic pleurae split up in deep inspiration. On inspiration this lower zone of the pleural cavity into which the lung enlarges is called the costodiaphragmatic recess.
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