THE LARYNX. 345 



Crico-tliyroid. From side of cricoid; passes back- 

 ward, and is inserted into the side of thyroid. 



Posterior Crico-arytenoid. From posterior broad 

 surface of cricoid into angle of arytenoid. 



Lateral Crico-arytenoid. From side of cricoid 

 beneath the cover of the thyroid into outer angle of 

 arytenoid. 



Arytenoid. Three sets of fibres, right and left 

 oblique and transverse between the arytenoids. 



Thyro-arytenoid. From anterior angle of arytenoid 

 to receding angle of thyroid. 



Those of the epiglottis are : 



Thyro-epiglottic. Inner 

 surface of thyroid to epiglottis. 



Superior Aryteno-epiglot- 



tic. Fibres pass from aryte- 



. . . 

 noid to epiglottis in aryteno- 



epiglottic folds. 



Inferior Aryteno-epiglot- FIG - 149.-THE HUMAN GLOTTIS. 



, . -n i . j 1, tongue ; e, epiglottis ; pe, pharyngo-epi- 



tlC. .from arytenOlCl tO Side glottic fold;ae, aryteno-epiglotticfoldiph, pos- 



* tenor wall of pharynx ; c. cartilage ; ts, superior 



of larynx, over the sacculus th y- ar ^ n id 

 laryngis. 



Within the larynx are also several folds arranged in 

 pairs. The aryteno-epiglottic inclose the fibres of the 

 aryteno-epiglottic muscles. These folds form the sides of 

 the inlet to the larynx, which is broad in front, where it 

 is completed by the epiglottis ; narrow behind, where it is 

 formed by the apices of the arytenoid cartilages. Im- 

 mediately below this fold is the cavity of the laryx, 

 which is limited below by the inferior border of the 

 cricoid cartilage. It is traversed on each side, from 

 front to back, by the superior or false and the inferior or 

 true vocal cords. The false vocal cords are formed by 

 the thyro-arytenoid muscles, which are covered by the 



