THE MECHANICS OF RESPIRATION 



339 



Fig. 116. Diagram to show the effect of high and low positions of the diaphragm on the 

 costal angle. 



Line 1. Normal position of diaphragm Costal margins move out during inspiration. 



Line 2. High position of diaphragm. Normal outward movement of costal margins accentuated. 



Line 3. Low position of diaphragm. Costal margins move in during inspiration. 



Line 4. Very low position of diaphragm. Costal margins move out during inspiration. 



Line 5. Actual line of traction of diaphragm. (From T. Wingate Todd.) 



