470 



OPEEATIONS ON THE RESPIRATORY APPARATUS. 



tation with his fingers in the superior part of the trachea. When 

 it is sufficiently expanded, a ligature is applied upon the India 

 rubber tube, and this is cut off. Though the tampon is inflated, 





Fig. 412.— Arytenectomy. The second step is over. The crico-thyroid ligament, cri- 

 coid cartilage, crico-tracheal ligament and the two first tracheal rings are divided. 

 The canula and the tenaculum are in place— tc. Cricoid Cartilage. IE, First King of 

 the Trachea. 



the canula has a tendency to slip in the lar\Tix, and for the pre- 

 vention of this accident should be secured by bands or strings tied 

 backward over the neck. 



Third /Stage. — Ablation of the Arytenoid Cartilage. — The 

 ablation of the cartilage is effected by several stej)s : 



{a) Incision of the Mucons Membrane along the Superior 

 and Posterior Borders of the Cartilage. — With a blunt bistomy 

 and a slight pressui-e, an incision is made in the mucous mem- 

 brane along the side of the superior and posterior borders of the 



