704 



ORGANS OF VOICE AND RESPIRATION. 



Fig. 356. The Cartilajr^s of the Larynx. 

 Posterior View. 



EPIGLOTTIS 



The posterior borders, thick and rounded, terminate, above, in the superior cornua ; 

 and, below, in the inferior cornua. The two superior cornua are long and narrow, 

 directed backwards, upwards, and inwards ; and terminate in a conical extremity, 

 which gives attachment to the thyro-hyoid ligament. The two inferior cornua 

 are short and thick ; they pass forwards and inwards, and present, on their inner 

 surfaces, a small, oval, articular facet for articulation with the side of the cricoid 

 cartilage. The posterior border receives the insertion of the Stylo-pl^aryngeus 

 and Palato-pharyngeus muscles on each side. 



The Cricoid Cartilage is so 

 called from its resemblance to 

 a signet-ring (xpixos 6oj, like 

 a ring}. It is smaller but thicker 

 and stronger than the thyroid 

 cartilage, and forms the lower 

 and back part of the cavity of 

 the larynx. 



Its anterior half is narrow, 

 convex, affording attachment in 

 front and at the sides to the 

 Crico-thyroid muscles, and, be- 

 hind those, to part of the Inferior 

 constrictor. 



Its posterior half is very 

 broad, both from side to side 

 and from above downwards ; it 

 presents in the middle line a 

 vertical ridge for the attachment 

 of the longitudinal fibres of the 

 oasophagus, and on either side 

 of this is a broad depression for 

 the Crico-arytgenoideus posticus 

 muscle. 



At the point of junction of 

 the two halves of the cartilage 

 on either side, is a small round 

 elevation, for articulation with 

 the inferior cornu of the thyroid 

 cartilage. 



The lower border of the cricoid 

 cartilage is horizontal, and con- 

 nected to the upper ring of the 

 trachea by fibrous membrane. 



Its upper border is directed ob- 

 liq uel v upwards and backwards, 



ARYTENOID 



d Cart'.". koM 



to the great depth of its 

 posterior surface. It gives at- 

 tachment, in front, to the crico- 

 thyroid membrane ; at the sides, 

 to part of the same membrane 

 and to the lateral Crico-aryte- 

 noid muscle ; behind, the highest point of the upper border is surmounted on each 

 side by a smooth, oval surface, for articulation with the arytenoid cartilage. Be- 

 tween the articular surfaces is a slight notch, for the attachment of part of the 

 Arytsenoideus muscle. 



The inner surface of the cricoid cartilage is smooth, and lined by mucous mem- 



brane. 



The Arytenoid Cartilages are so called from the resemblance they bear, when 



