Fjg. 9. _Ai-y tenotomy. The second phase of the operation. The 

 crico-thyroid ligament, the cricoid cartilage, the crico-tracheal 

 ligament, and the two first rings of the trachea are cut through. 

 The canula and spring hooks are in position.— CC, cricoid; 

 1st A, first tracheal ring. 



