426 



HEAD AND NECK 



passes through the centre of the two joints. Each capsular 

 ligament is strengthened by stout bands on the posterior 

 aspect of the joint. 



The thyreoid cartilage should now be removed by dividing the ligaments 

 which surround the crico- thyreoid joint. 



Cartilage Cricoidea. This is shaped like a signet ring. 



Hyoid 



Cartilago triticea 



Thyreo-epiglottic 

 ligament 



Superior cornu 



Corniculate cartilage 

 Arytaenoid 



Muscular process 

 of aryta;noid 



Inferior cornu 

 of thyreoid 



FIG. 168. Posterior aspect of Cartilages and Ligaments of Larynx. 



The broad posterior part, the lamina^ is somewhat quadrilateral 

 in form. Its superior border presents a faintly marked 

 median notch, and on each side of this 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 hollo wed -out 

 areas which give attachment to the posterior crico-arytaenoid 

 muscles. The median ridge itself gives origin to a tendinous 



