THE LARYNX 



335 



upper margin of the lateral crico-arytsenoid muscle, and the 

 medial fibres, which run along and to a certain extent are 

 attached to the ligamentum vocale, 1 form a bundle, triangular 

 in frontal section, to which the term internal thyro-arytaenoid 

 muscle was formerly applied. The vocalis muscles protract 

 the arytaenoid cartilages, and adduct and relax the vocal 

 folds. They are supplied by the inferior laryngeal nerves. 



Ligamentum Vocale. There are two vocal ligaments, 

 right and left. Each is the thickened free upper border of 



Epiglottis - 



Ary-epiglotticus 



Tubercle of epiglottis 



Ventricular fold V 



Ventricle of larynx - \ 



Vocal fold 



Musculus vocalis 



M. cricoarytaenoideus lateralis' 



M. cricothyreoideus 

 Cricoid cartilage 



FIG. 125. Frontal section of Larynx, showing Muscles. 



the corresponding lateral part of the conus elasticus, and it 

 constitutes the support of the vocal fold. Anteriorly^ it is 

 attached, close to its fellow of the opposite side, to the 

 middle of the angular depression between the two laminae of 

 the thyreoid cartilage. Posteriorly -, it is attached to the tip 

 and upper border of the processus vocalis, which projects for- 

 wards from the base of the arytaenoid cartilage. The vocal liga- 

 ment is composed of yellow elastic fibres. Its medial border 

 is sharp and free, and is clothed with mucous membrane, 



1 The fibres which are attached to the ligamentum vocale are called 

 collectively the ary-vocalis muscle. 



