14 J Salivary Glands. 



340. Lobules of the Parotid Gland, natural size. 



After a specimen of 1 1 g. 



The sublingual gland, Glandula sublingualis, rests on the upper 

 surface of the mylo-hyoid muscle; its excretory ducts (eight to twelve), 

 Ductus Rivini, open behind the Caruncula sublingualis, or join to form a 

 common duct, the ^Ductus Bartholini, which blends with Wharton's duct, or 

 opens separately at the caruncula. 



The salivary glands are compound racemose glands ; a number of acini 

 form a lobule, which has a very small excretory duct; the small ducts 

 unite to form larger ones, these again form the chief excretory duct. 



The tongue, Lingua (Fig. 341), is a muscular organ situated in 

 the floor of the mouth ; it has an upper surface or dorsum, an under surface, 

 two lateral borders, an apex or tip, a body, and a base or root. The 

 upper convex surface contains numerous gustatory papillae, which are 

 found as far back as the region of the isthmus of the fauces ; from 

 here to the hyoid bone there are mucous and follicular glands. On the 

 under surface, which has no papillae, the mucous membrane forms a fold, 

 the Fraenulum linguae,; at the sides the Arcus palato-glossi are attached. 

 The base or root of the tongue is attached to the hyoid bone ; from it 

 a middle and two lateral folds of mucous membrane, the glosso-epiglottic 

 folds, Ligamenta glosso-cpiglottica medium ct latcralia, pass to the epiglottis. 



The tongue is divided into two halves, by a fibrous septum, the 

 Septum medianum linguae (see Fig. 329); at the tip of the lingual muscle 

 the acinous Glandula Nulinii s. Blandini about the size of a bean (see 

 Fig. 339) is imbedded; its excretory ducts open at the Crista fimbriata, 

 a fold of mucous membrane, which runs 'obliquely backwards and outwards. 



