472 



OPEBATIONS ON THE RESPIRATORY APPARATUS. 



Fig. 414.— 3d Stn-). b, Section of the Vocal Cord. 



downward with the scissors. To facilitate this part of the oper- 

 ation, the cartilage must be firmly held with either the hooked or 

 the bull-dog forceps, and carried toward the median line, when 

 the inferior border and the external face are dissected, and drawn 

 backward and upward when the dissection goes on, on the ante- 

 rior border. The only important or jiarticular caution needed 

 here, is to hold the point of the scissors always m contact with 

 the cartilage, to keep close to it, to save the mucous membrane, 

 and to avoid the larjTigeal ventricle as well as the tissues loosened 

 from the external face of the cartilage. Toward the end of this 

 thu'd step, when the cartilage is separated from the fibres of the 

 thyro-arytenoid muscle, a hemorrhage takes place from the divid- 

 ed laryngeal branch of the thyroid artery (Fig. 416). This must 

 be controlled by torsion or artery nippers. 



(c) Section of the Cartilage near its Articulation with the 



