9 2 



Physiology. 



Pneumonia. Pneumonia is inflammation of the lungs. 

 It was formerly called "lung fever." It is due to bacteria. 



The Diaphragm. The diaphragm is a thin muscle mak- 

 ing a complete partition between the abdominal cavity and 

 the chest cavity. It is convex above and concave below 

 where it fits over the liver and stomach. Its front edge is 

 attached to the inside of the chest wall about opposite the 

 lower end of the breastbone. Its general position is shown 

 in Figs. 53, 55, and 58. 



Triangularis Sterni 

 Internal Mammary Vessels \ 



Left Phrenic 

 Nerve 



Pleura 

 Pulmonalis 



Pleura Costal! 



Mediastinum 



( Sympathetic Nerve 



Vena Azygos Major ) 



Posterior 



I Thoracic Duct Pneumogastric Nerves) 



Fig. 56. A Cross-section of the Chest, showing the Heart, Lungs, and Blood Tubes. 



To show the Action of the Diaphragm and Lungs. MATERIAL. 

 Bell jar with stopper, sheet of rubber (such as used by dentists) large 



