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ELEMENTARY PHYSIOLOGY 



which, when the cords are sufficiently parallel and tense, 

 produce that musical note which constitutes the voice, but 

 otherwise give rise to no audible sound at all. 



15. The Voice. — Voice consists simply of the sound, 

 or musical note, which results from the vibration of the 



Fio. lOG. 



I. View of the human larynx from above as actually seen by the aid of 

 the instrument called the laryngoscope ; A, in the condition when voice 

 is being produced ; B, at rest when no voice is produced. 



e. Ejiiglottis (foreshortened). 



c.v. The vocal cords. 



c.r.s. The so-called false vocal cords, folds of mucous membrane lying 

 above the real vocal cords. 



a. Elevation caused by the arytenoid cartilages. 



«.w. Elevations caused by small cartilages connected with the ary- 

 tenoids. 



I. Root of the tongue. 



II. Diagram of the same. 



vocal cords. Other things being alike, the musical note 

 will be low or high, according as the vocal cords are 

 relaxed or tightened : and this again depends upon the 

 relative predominance of the contraction of the crico- 



