1212 



THE RESPIRATORY SYSTEM 



ment of the crico-arytsenoid muscles, while the anterior angle is extended as a 

 sharp projection, the vocal process [processus vocalis], which serves for the 

 attachment of the vocal ligament. The surfaces of the arytaenoid are named 

 medial, posterior, and antero-lateral. The narrow medial surface, covered by the 

 mucosa of the larj^nx, is nearly vertical, and faces the corresponding side of the 

 opposite arytaenoid, from which it is separated by a small space. The posterior 

 surface is concave for muscular attachment. The antero-lateral surface is the 

 largest, and presents an irregular contour. 



On this surface a ridge, the arcuate crest [crista arcuata], extends horizontally between 

 two hollows— the triangular fovea [fovea triangularis] above, which lodges some mucous 

 glands, and a larger depression below, the oblong fovea [fovea oblonga] for the vocal muscle. 

 The coUiculus is a small eminence found upon the anterior margin and antero-lateral surface. 



Fig. 974. — Front View of the Laryngeal Skeleton. (Modified from Bourgery and Jacob.) 



Greater cornu of hyoid' 



Body of hyoid 

 Lateral hyo-thyreoid ligament 



Triticeous cartilage 



Foramina for superior laryngeal 



vessels and internal laryngeal n. 



Median hyo-thyreoid ligament 



Superior cornu of thyreoid 



Superior thyreoid notch. 

 Lamina of thyreoid 



Oblique line 



Median crico-thyreoid ligament 



Inferior cornu of thyreoid 



Crico-thyreoid joint 



Crico-tracheal ligament 



Tracheal cartilage. 



The corniculate cartilages (of Santorini) [cartilagines corniculat?e(Santorini*)] 

 (figs. 973, 977). — -This pair of small conical cartilages is set upon the bent apices of 

 the arytaenoids, continuing their curves backward and medialward. 



The corniculate cartilage is not an independent structure in many lower animals, and its 

 continuity with the aryticnoid is sometimes met with in man where the two cartilages are 

 noriiially developed in a continuous mass of tissue. 



I'hc epiglottic cartilage [cartilago opiglottica] (figs. 973, 977, 981, 987), 

 unpaired, invested Ijy mucosa behind and ])artly in front, thin and leaf-shaped, 

 stands behind the root of the tongue and the body of the hyoid. It lies above the 

 thyreoid cartilage, in front of the entrance of the larynx. The free upper margin 

 is convex, or notched; the lower end tapers to a short stalk, the petiole of the 

 epiglottis [petiolus epiglottidis], to which the thyreo-epiglottic ligament is 

 attached. 



The anterior surface is free above and covered by mucosa; in its lower part 

 it is bound to tlie body of the hyoid, and is separated by a mass of fat from 



* Santorini: Venetian anatomist. B. 1G8I, D. 1737. 



