PAROTID GLAND. 



285 



smaller, papilla?. Like the mucous membrane, they are covered 

 by a thick layer of squamous epithelium, which is sometimes 

 imbricated. It is generally believed that the caliciform papillae 

 are subservient to the special sense of taste ; that the fungiform 

 variety possesses common sensibility ; while the filiform papillae 

 serve a mechanical purpose during the action of the tongue on 

 the food. 



The blood-supply of tlie tongue comes from the lingual and 

 sublingual branches of the glosso-facial artery, and the blood is 

 returned by the lingual or rauine, and sublingual veins. 



The principal nerves are — the lingual, or gustatory branch of 

 the fifth ; the lingual branch of the glosso-pharyugeal ; and the 

 hypoglossal or twelfth pair. 



Flo. 91. 

 Parotiil and molar glands of the left side, a a, Parotid gland ; b 6, Steuo's duct 

 lid J, Inferior molar glands. 



•SALIVARY GLANDS. 



c, Superior, 



The salivary glands are accessories of the mouth. They 

 secrete the saliva, which is discharged into the mouth, and 

 saturates the food, during mastication. There are three primary 

 pairs— viz., the Parotid, the Submaxillary, and the Sublingual. 



PAROTID GLAND. 



This, the largest of the salivary glands, is long and flat, and 

 is situated in the space bounded by the posterior border of the 



