316 



BOVINE PATHOLOGY. 



repose on the inferior surface of the trunk while chewing 

 the cud ; for, thanks to the synovial union between the 

 sternal and vertebral ribs, supero-inferior compression 

 leads to lateral expansion of the chest. Synovial union 

 of the first bone of the sternum with the second facili- 

 tates this. To this point of conformation also is attri- 

 buted the fact that the ox in the emergencies of pul- 

 monary disease often remains in the recumbent posi- 

 tion, a marked contrast to the persistent standing of 



Fig. 63. — Healthy lungs of the ox, seen from above. Showing the extra 

 lobe of the right lung with its bronchus (J), a. Trachea, c. Kight 

 bronchus, d. Right bronchial tubes. (Simonds.) 



the horse under similar circumstances. A study of 

 the arrangement of the respiratory muscles in ruminants 



