The pleura is comprised of two layers: The visceral and parietal pleura join at the hilum, which serves as the point of entry for blood vessels, nerves, and the large airways of the lungs called ...

In dogs, the pleural cavity exists as a potential space, with the visceral and parietal pleurae separated only by a thin layer of pleural fluid. Dogs have 13 paired ribs, numbered 1–13 ...