138 



CONSCIOUS NERVOUS OPERATIONS 



185. The Vocal Cords. The larynx is smoothly lined 

 with mucous membrane except where it narrows at the 

 glottis. Here at the base of the epiglottis are seen, first, 

 on each side of the lining membrane, ridges called false 

 vocal cords, which are not concerned in speech (Fig. 82). 

 They play the chief part in closure of the glottis during 

 expiration. A little below them are the true vocal cords* 



Opening of 

 Kustachian tube 



Soft palate 



Epiglottis 



Glottis 

 Esophagus 



Larynx 



Hani palate 



Tongue 



Hyoid bone 

 False vocal cords 



. True vocal cords 



Thyroid carti- 

 lage 



carti- 

 lage 



Fig. 82. Vertical section of the head and neck. 



thickened bands of elastic tissue running in the mucous 

 membrane from the front angle of the thyroid cartilage 

 backward to their attachment at the base of the arytenoid 

 cartilages. Between the true and the false vocal cords is, on 

 each side, a recess called the ventricle. The true vocal cords 

 have fine, smooth edges, and are shining white in color. 



186. The Glottis. In ordinary respiration the glottis is 

 a triangular opening with its apex in front. In deep or 



