TRACHEOTOMY. 63 



12. TRACHEOTOMY. 

 Fig. 2. 



Instruments. Razor, scissors, con-vex scalpel, tenacula, 

 tenaculum and ligation forceps, trachea tube, and suture 

 material. 



Technic. In the Superior third of the cervical region, 

 in the neighborhood of the fourth to the sixth tracheal ring, 

 shave and disinfect the skin on the anterior surface of the 

 neck to the extent of 10 cm. long by 5 cm. wide. The 

 operation is best performed upon the standing animal with 

 the head extended. In lateral decubitis of the horse the 

 operation is carried out with some difficulty, and generally 

 the operator fails to get the incision on the median line. 



Fig. 2. 



Tracheotomy, s, sterno-thyro-hyoiideus muscle ; t, trachea ; 

 sch, mucous membrane of the posterior wall of the trachea ; 

 /, interannular ligament. 



The operator stands before the right shoulder of the horse 

 with an assistant opposite him. 



Make the incision by rendering the .skin tense along the 

 median line of the trachea with the left hand and then mak- 

 ing a drawing cut from above to below with the scalpel. 

 After the skin muscle is cut through, in order to avoid hem- 



