THE LARYNX 



34i 



a short posterior part and a longer anterior part. The lateral 

 surface of the lamina is relatively flat. Immediately below 

 the posterior part of the upper border, and anterior to the root 

 of the superior cornu, there is a distinct prominence called the 

 superior tubercle. From that point an oblique ridge descends 

 towards the inferior tubercle on the lower border of the lamina. 

 The ridge gives attachment to the sterno-thyreoid, thyreo-hyoid 

 and the inferior 



constrictor muscles, ff\ Epiglottis 



and divides the 

 lateral surface of 

 the lamina into an 

 anterior and a pos- 

 terior part. To the 

 posterior part, which 

 is much the smaller 

 of the two, is at- 

 tached the inferior 

 constrictor muscle 

 of the pharynx. 

 T.he medial surface of 

 the lamina is smooth 

 and slightly concave. 

 To the angular 

 depression between 

 the two laminae are 

 attached the thyreo- 

 epiglottic ligament, 

 the ventricular and 

 the vocal ligaments. 

 Crico-thyreoid 

 Joints. The articu- 

 lation, on each side, 

 between the tip of the inferior cornu of the thyreoid car- 

 tilage and the side of the cricoid cartilage, belongs to the 

 diarthrodial variety. The opposed surfaces are surrounded 

 by an articular capsule which is lined with a synovial stratum. 

 The movements which take place at the joints are of a 

 twofold character viz., (i) gliding; (2) rotatory. In the 

 first case the cricoid facets glide upon the thyreoid surfaces in 

 various directions. The rotatory movement is one in which 

 the cricoid cartilage rotates around a transverse axis which 



Hyoid 



Cartilago triticea 



Thyreo-hyoid 



"membrane 



Superior cornu 

 of the thyreoid 

 cartilage 



Superior tubercle 



Oblique line 

 Inferior tubercle 

 Inferior cornu 

 Conus elasticus 

 Cricoid cartilage 



FIG. 128. Profile view of Cartilages and 

 Ligaments of Larynx. 



