371, The Cartilages of 

 the Larynx. 



Lateral View. 



The larynx is composed of A* j| Q art . 



the following cartilages : ^ri 



a) The thyroid cartilage, 

 Cartilago thyreoidea, consists of two m 

 lateral lamellae, quadrilateral in 

 form, united at an acute angle; 

 the upper border is deeply 

 notched in the middle line, imme- 

 diately above the Pomum Ada/mi 

 (Prominentia laryngis), while on either 

 side it is somewhat concave. The 

 posterior border of each lamella 

 terminates in the superior and 

 inferior cornua, Cornu super ius 

 (longum) and Cornu infer ius (breve). 



b) The cricoid cartilage, 

 Cartilago cricoidea, lies below the 



thyroid cartilage, between its inferior cornua, with which it articulates ; 

 it is shaped like a signet ring and has a narrow anterior and a broad 

 .posterior portion. The upper border of the posterior portion has two 

 oval facets for articulation with the bases of the arytenoid cartilages. 



c) The arytenoid cartilages, Cartilagines arytaenoideac (a right 

 and a left), are pyramidal in form, and rest by their bases on the posterior 

 and highest part of the cricoid cartilage; the apex of each cartilage is 

 pointed and curved backwards and each has three surfaces, an inter- 

 nal, external or anterior and a posterior, all covered by the 

 laryngeal mucous membrane. The anterior angle of the b a s e forms a 

 horizontal projection, the vocal process, Processus vocalis } for the 

 true vocal cord; the external, the muscular process, Processus muscularis, 

 for the insertion of the posterior and lateral crico-arytenoid muscles. 



Heitzmann, Atlas. II. 6 



JLrtic.facet 

 'f.t.CorZu inf. 

 cart, thyreoid. 



Cartilages of the 

 T 



> 



View of tlie separate cartilages, 

 from Behind. 



