KELATIONS OF THE LARYNX. 533 



The glands of the larynx are distinguished into the epi- 

 glottic and arytenoid. The former are nothing more than 

 a mass of fatty matter situated between the epiglottis and 

 thyro-hyoid membrane. The only epiglottic glands, says 

 Cruveilhier, belonging to the epiglottis are found within 

 its substance, which is perforated with innumerable orifices 

 for their reception. All of these ducts open upon the laryn- 

 geal surface and furnish a considerable quantity of mucus. 



The arytenoid glands are found in the aryteno-epi glottic 

 folds of mucous membrane, and must not be confounded 

 with some little cuneiform cartilaginous bodies also seen 

 in this situation. 



Blood-vessels. The arteries supplying the larynx are 

 four in number, the two superior, and two inferior thyroid. 

 The former come from the external carotid the latter 

 from the subclavian. The veins accompanying the arte- 

 ries terminate in the adjoining venous trunks. 



Nerves. The nerves (Fig. 152) supplying the larynx 

 are four in number, and all come from the pneumo-gastric 

 or par vagum. Two are above, arise near the base of 

 the cranium, and are called the superior laryngeal. The 

 other two are below, arise from the par vagum at the root 

 of the neck, and are called the inferior laryngeal, or recur- 

 rent nerves. The former chiefly supply the mucous mem- 

 brane of the larynx, and are mostly nerves of sensation. 

 The latter go principally to the muscles, and are mostly 

 nerves of motion. For a more minute description of the 

 blood-vessels and nerves of the larynx, see the circulation 

 and nerves of the neck. 



Relations of the Larynx. The relations of the human 

 larynx are three-fold, physical^ mental and organic. The 

 physical are those which the larynx has with atmospheric 

 air in the production of voice. The mental are those con- 

 nected with the cerebrum, as the representative and instru- 

 ment of the mind, and are concerned in the intellectual 

 functions of language and oratory; while the organic refer 

 more particularly to the relations of the larynx with all 

 the other organs of the body. By means of the pneumogas- 



