TRACHEA. 



m 



Glands. The mucous membrane of the larynx is furnished with numerous 

 muciparous glands, the orifices of which are found in nearly every part ; they are 

 very numerous upon the epiglottis, being lodged in little pits in its substance ; 

 they are also found in large numbers along the posterior margin of the aryteno- 

 epiglottidean fold, in front of the arytenoid cartilages, where they are termed the 

 arytenoid glands. They exist also in large numbers upon the inner surface of the 

 sacculus laryngis. None are found on the vocal cords. 



Vessels and Nerves. The arteries of the larynx are the laryngeal branches 

 derived from the superior and inferior thyroid. The veins empty themselves into 

 the superior, middle, and inferior thyroid veins. The lymphatics terminate in the 

 deep cervical glands. The nerves are the superior laryngeal, and the inferior or 

 recurrent laryngeal branches of the pneumogastric nerves, joined by filaments from 

 the sympathetic. The superior laryngeal nerves supply the mucous membrane of 

 the larynx, and the Crico-thyroid muscles. The inferior laryngeal nerves supply 

 the remaining muscles. The Arytenoid muscle is supplied by both nerves. 



THE TRACHEA. 



The trachea or air-tube is a cartilaginous and membranous cylindrical tube, 

 Fig. 361. Front View of Cartilages of Larynx, the Trachea and Bronchi. 



