SIR CHARLES BELL ON THE ORGANS OF THE HUxMAN VOICE. 319 
Explanation of the Plates. 
Plate IX. 
This figure represents a section of the face and throat, exhibiting the organs 
of the voice in one view. 
A. The trachea. 
B. The chorda vocalis of the right side: above it we see the sacculus laryngis. 
C. The arytenoid cartilage, which being moved by many muscles, changes the 
condition of the ligament or chorda vocalis. 
D. The epiglottis, which falls like a valve over the glottis, as the morsel passes 
in swallowing, but which is important to the voice as directing the stream 
of vibrating air upon the fauces. 
E. The bag of the pharynx, that cavity into which the sound is directed, and 
by the contraction of which an appulse is given in articulating certain 
consonants. 
F. The uvula and velum palati, which, acting like a valve, and closing the 
passage upwards into the cavities of the face, throw the force of the 
contracting pharynx forwards into the mouth. 
G. The cells of the bones of the face, through which some sounds are pro- 
duced by reverberation. 
H. The palate, the roof of the mouth, and floor of the nasal cavities. 
I. The tongue. 
All the dark or shaded part of the figure marks the extent of the cavities 
employed in the formation of the voice. 
Plate X. 
Fig. 1. The larynx and trachea seen in front — in outline. The thyroid gland 
is shaded. 
A. The thyroid cartilage. 
B. The cricoid cartilage. 
C. The trachea. 
DD. The thyroid gland seated below the larynx and embracing the 
upper part of the trachea. 
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