342 



HEAD AND NECK 



passes through the centres of the two joints. Each articular 

 capsule is strengthened by stout bands on the posterior 

 aspect of the joint (Fig. 129). 



Dissection. Divide the ligaments which surround the crico- 

 thyreoid joint, and remove the thyreoid cartilage. 



Cartilage Cricoidea. The cricoid cartilage is shaped like 



Hyoid 



Cartilage triticea 



Thyreo-epiglottic 

 ligament 



Superior cornu 



Corniculate cartilage 

 Arytaenoid 



Muscular process 

 of arytaenoid 



Inferior cornu 

 of thyreoid 



FIG. 129. Posterior aspect of Cartilages and Ligaments of Larynx. 



a signet ring. The broad, posterior part, called thelamina, 

 is somewhat quadrangular in form. Its superior border 

 presents a faintly marked median notch, and on each side 

 of the notch there is an oval, convex facet which articulates 

 with the base of the arytaenoid cartilage. The posterior 

 surface of the lamina is divided, by an elevated median ridge, 

 into two slightly hollowed -out areas which give attachment 

 to the posterior crico-arytaenoid muscles. The median ridge 



