312 



THE VOICE. 



[BOOK in. 



Cri 



FIG. 184. DIAGRAM OF THE LARYNX IN VERTICAL TRANSVERSE SECTION. 



Hy. Hyoid bone. Th. Thyroid cartilage; Cn. Cricoid cartilage; m. th. h. thyro- 

 hyoid membrane, all cut across. 



e. epiglottis, / its cushion, c.v.s. ventricular bands, c.v. vocal cords, with v. the 

 ventricles of the larynx between them. T the trachea. 



A. The internal thyro-arytenoid muscle, cut across ; it is seen to form the bulk of 

 the wedge-shaped projection of which the vocal cord is the extreme edge. 

 B the external thyro-arytenoid, cut across 



weal cords (Figs. 183, 184 c.v.s.), and their existence gives rise 

 to two pouches or bags, the ventricles of the larynx, (v.) one on 

 each side, between the ventricular - band above and the vocal 

 cord below. 



903. The mucous membrane lining the larynx is a continu- 

 ation of that lining the trachea ( 319), and as a whole presents 

 the same features namely a ciliated epithelium of several cells 

 deep, among which are many goblet cells, resting on a dermis 

 largely composed of retiform or even adenoid ( 259) tissue and 

 containing many elastic fibres running for the most part in a 

 longitudinal direction ; but special modifications occur in par- 

 ticular places. 



Over the vocal cords themselves the cilia are absent ; traced 

 upwards from the trachea they disappear just below the glottis but 

 appear again just above it ; the epithelium occupying this narrow 

 interval and thus covering the vocal cords is a thin stratified epi- 



