THE MECHANICS OF RESPIRATION 



323 



Fig. 117. Diagram to show the effect of clinical displacements of the diaphragm on the costal 

 angle. 



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



2. Position of diaphragm in general cardiac enlargement. Costal margin from ensiform to ninth 

 rib moves toward median line. 



3. Position of diaphragm in left-sided cardiac enlargement. Left costal margin is fixed or 

 moves in during inspiration. 



4. Position of diaphragm in right-sided cardiac enlargement. Right costal margin is fixed or 

 moves in during inspiration. 



5. Costal margin. (From T. Wingate Todd.) 



