THE LAEYXX 



vestibule anastomose with the radicals of the facial vein which 

 supply the adjacent skin. 



The lymphatics of the olfactory region can be readily injected 

 from the sub-dural spaces of the meninges. They form a network 

 in the connective tissue 

 of the tunica propria. 



THE NASO- PHAR- 

 YNX. This cavity, like 

 that of the nose, is 

 limited by a bony wall. 

 Its mucous membrane 

 is continuous anteriorly 

 with that of the respira- 

 tory portion of the nose, 

 and posteriorly with 

 that of the oro-pharynx. 

 The structure of its 

 mucous membrane re- 

 sembles that of the 

 Schneiderian mem- 

 brane, but its dorsal 

 wall, in addition to the 

 ciliated epithelium, the 

 thin-walled blood ves- 

 sels, and the numerous 

 secreting glands, contains many small nodules of lymphoid tis- 

 sue. These nodules form a considerable mass, the pharyngeal 

 tonsil. 



The ciliated epithelium of the naso-pharynx is also continuous 

 with the lining epithelium of the Eustachian tube. The tunica 

 propria is firmly adherent to the bony wall of the dorsal surface, 

 but is more loosely attached laterally and ventrally to the pharyn- 

 geal and palatine muscles. 



THE LARYNX, The wall of the larynx is formed by several 

 large plates of hyaline cartilage thyroid, cricoid, and arytenoid 

 cartilages which are firmly united by ligamentous bands of fibrous 

 tissue ; the cartilaginous wall incloses a mucous membrane of con- 

 siderable thickness. 



The larger cartilages are of the hyaline variety and are prone 

 to ossify in adult life. The tips of the arytenoids, the cornicula 

 of Santorini, the cuneiform cartilages of Wrisberg, and the epi- 



FIG. 196. VERTICAL SECTION OF THE OLFACTOKY 

 MUCOSA OF A KITTEN. 



a, deep, and 6, superficial border of the epithelium ; 

 o, olfactory cells ; d, sustentacular cells ; <7, olfactory 

 nerve fibres in the corium of the mucosa. Golgi stain. 

 x 325. (After Kolliker.) 



