THE LARYXX 



911 



tliyroid cartilage, their tension and ])<)siti()n varying under muscular action. The 

 cords are pearly white in a})pcarance, and i)rcsent flattened surfaces where they face 

 • ■ach other internally, Avith a free sharp edge above. Itis this edge which is thrown 

 into vil)rations during plionation. 



They are, according to Testut, al)()Ut four-fifths to one inch long (20 to 24 mm. ), 

 in tlie male, and three- to four-fifths of an inch (15 to 20 mm.) in length, in tlie 

 female. 



Fig. 533. — View of Interior of Larynx as seen during Inspiration. 



Vallecula — 



Cushion of epiglottis 



True vocal cord 



Rima glottidis 



Sinus pyrilormis 



Arytenoid commrssure 



BASE OF TONGUE 



Median glosso-epiglottidean fold 



EPIGLOTTIS 



Fossa innominata 

 Aryteno-epiglottidean fold 



CARTILAGE OF WRISBERG 



CARTILAGE OF SANTORINI 



Pharynx 



The rima glottidis is the chink bounded on each side by the vocal cords and 

 tlie inner surfaces of the arytenoid cartilages with their vocal processes; the inter- 

 cordal jiortion is known as the glottis vocalis, and the interarvtenoid part as the 

 glottis respiratoria; the length of the former is the same as that of the vocal cords, 

 and that of the latter is about a quarter of an inch (6 to 7 mm.) in the male and 

 5 to 6 mm. in the female. (Testut. ) 



Fig. 5.34. — View of Interior of Larvnx as seen during Vocalisation. 



BASE OF TONGUE • 



Median glosso-epiglottidean fold ^ 



X 



h 



EPIGLOTTIS 



Cushion of epiglottis 



Ventricle 

 Aryteno-epiglottidean fold 



- — CARTILAGE OF WRISBERG 



CARTILAGE OF SANTORINI 



Arytenoid commissure 



It is limited behind l)y the interarvtenoid fold, and presents the aiii)earance of 

 an elongated triangle. 



When observed during life, the rima glottidis is seen to vary very considerably. 

 On inspiration the vocal cords, whilst almost touching in front, are separated 

 behind from a quarter to half an inch (6 to 12 mm.), forming an angle directed 

 outwards, where they terminate in the vocal processes, the glottis presenting a 

 lozenge-shaped appearance. 



