TRACHEOTOMY. 



59 



12. tracheotomy: 



Fig. 1. 



Instruments. Razor, .scissors, convex scalpel, teiiacula, 

 tenaculum and ligation forceps, trachea tube, and suture ma- 

 terial. 



Technic. In the superior third of the neck, in the region 

 of the fourth to the sixth tracheal ring, shave and disinfect 

 the skin on the anterior surface of the neck to the extent of 

 lo cm. long by 5 era. wide. The operation is best performed 

 upon the standing animal with the head extended In lat- 

 eral 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. The operator stands before the 



Fig. 2. 

 Tracheotomy, s, stemo-thyro-hyoideus muscle ; t, trachea ; 

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

 /, interannular ligament. 



right shoulder of the horse and the assistant opposite him. 

 On the shaved area the operator and his assistant takes up a 

 transverse fold of skin 3 to 4 cm. high, and divides the same 

 by an incision. The 6 to 8 cm. long wound in the skin then 



