CHAPTER X. 



Tab. XXI, — the larynx. 



Fig. 1. The larynx, pharynx, &c. a, the os hyoides, 6, the 

 epiglottis pressed down, thus covering the glottis, or opening 

 of the larynx ; as it does in the act of deglutition. 



Fig. 2. Exhibits the larynx, and trachea ; which is a contin- 

 uation of the former ; h, the epiglottis ; g, the arytenoid carti- 

 lages ; e, the thyroid cartilage, exceedingly strong, for the pro- 

 tection of the upper part of the air tube ; d, the cartilaginous 

 ringlets of the trachea or wind-pipe, each forming nearly two- 

 thirds of a circle, and completed by a soft membrane, which, 

 from its apposition to, e, Fig. 1, the cesophagus, accommodates 

 itself to the substances passing into the stomach. 



Fig. 3. The larynx or upper part of the wind-pipe of a bird. 



