1276 



A MANUAL OF ANATOMY 



the aryteno-epiglottidean fold of mucous membrane. The anterior 

 or lingual surface is free over its upper part, where it faces the base 

 of the tongue, and is covered by mucous membrane. This mem- 

 brane is prolonged on to the base of the tongue as the glosso- 

 epiglottidean fold, or frenum epiglottidis, which is mesially placed. 

 It is also prolonged from the sides of the epiglottis on to the 

 lateral walls of the pharynx as the pharyngo-epiglottidean folds. 

 On either side of the frenum epiglottidis, between it and each 



Epiglottis- 



Superior Cornu of Thyroid . 



Cartilage 



Cuneiform Cartilage _ 



(Wrisberg) / 



Corniculum Laryngb^jr — | 

 (Santorini) 



Arytaeno-epiglottideus_J 

 (Arytaenoideus Obliiiuus) V, 

 Arytaenoideus Transversus 



Crico-arytaenoideus Posticus 



Crico-thyroid Joint 



Cricoid Cartilage 



Trachea-—'' 



i 



Fig. 524. — The Intrinsic Muscles of the Larynx (Posterior View). 



pharyngo-epiglottidean fold, there is a depression or fossa, which 

 is known as the vallecula. Lower down than these folds the 

 anterior surface is connected to the back of the upper border of 

 the body of the hyoid bone by an elastic, semilunar membrane, 

 called the hyo-epiglottidean ligament. Above the upper border 

 of the thyroid cartilage the anterior surface is separated from the 

 posterior aspect of the thyro-hyoid membrane by a collection of 

 adipose and elastic tissues, which is known as the periglottis (epi- 

 glottidean gland). The posterior or laryngeal surface is free over 

 its whole extent, and is covered by mucous membrane. It is con- 

 cave from side to side, and concavo-convex from above down- 

 wards. The lower convexity forms the cushion or pulvinar. When 

 the mucous membrane is removed the epiglottis presents a number 

 of small glandular pits. 



Development. — The epiglottis is developed from the loop of the lurcula. 



