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of lungs ...at the hilum. Depending on the subjacent structures,
the parietal pleura can be subdivided into three portions: the
mediastinal, costal, and diaphragmatic pleurae. The lung
surfaces facing these pleural areas are named accordingly, since
the shape of the lungs is determined by the shape of the pleural
cavities. Because of the presence of pleural recesses, which
form a kind of reserve space,... What made you want to look up
"pleural sac"? Please share what surprised you most...