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The dome of the pleura.

Pleura

The dome of the pleura.

Left pleural sac in a subject hardened by formalin injection, opened into by the removal of the costal part of the parietal pleura. The lung has also been removed so as to display the mediastinal pleura.

Pleural Sac

Left pleural sac in a subject hardened by formalin injection, opened into by the removal of the costal…

Diagram showing arrangement of pleural sacs, as seen in transverse section.

Arrangement of the Pleural Sacs

Diagram showing arrangement of pleural sacs, as seen in transverse section.

Transverse section through the trachea and its immediate surroundings at the level of each of the upper five dorsal vertebrae.

Sections Through Trachea

Transverse section through the trachea and its immediate surroundings at the level of each of the upper…