ANTERIOR ASPECT OF HEAD AND NECK. 



thin and run from the upper borders of the thyroid to the 

 back of each great cornu of the hyoid. Each lateral margin is 

 thick (ligamentum thyro-hyoideum laterale) and runs from 

 the tip of the superior cornu of the thyroid to the tip of the 

 great cornu of the hyoid, often enclosing a nodule (cartilage 

 triticea). . [962] 



The crico-thyroid membrane consists of a central and two 

 lateral parts, which are continuous. The central part is trian- 

 gular, its apex attached to the centre of the lower border of 

 the thyroid, and its base to the upper border of the anterior 

 arch of the cricoid. Each lateral part, sloping upward and in- 

 ward, is continuous above with the inferior thyro-arytenoid 

 ligament; it is attached below to the upper border of the cri- 

 coid, behind to the lower border of the vocal process of the 

 arytenoid, and in front to the inner part of the ala of the thy- 

 roid, close to the angle. [962] 



Thyro-arytenoid Ligaments. The inferior are the upper 

 margins of the lateral parts of the crico-thyroid membrane; 

 each runs from the tip and upper border of the arytenoid vocal 

 process to the middle of the angle between the thyroid also, 

 close to its fellow. The superior run from the thyroid, just 

 above the preceding, to the tubercle on the antero-external 

 surface of each arytenoid. [963] 



Epiglottidean Ligaments. The glosso-epiglottidean, middle 

 and lateral, are three mucous folds running from the centre 

 and each margin of the epiglottis to the base of the tongue, 

 and to the sides of its base and the pharyngeal wall, respec- 

 tively; between them are two fossae (valleculse). The hyo- 

 epiglottidean is a broad band running from the anterior sur- 

 face of the epiglottis to the upper border of the hyoid. The 

 thyro-epiglottidean runs from the lower end of the epiglottis to 

 the angle between the thyroid ate, below the notch. [963] 



Interior of Larynx. The true and false vocal cords divide 

 it into three divisions. Its superior aperture is triangular with 

 its apex between the arytenoids; the epiglottis forms its base; 



[91] 



