THE TONGUE. 



145 



Openings of the Ducts of Rivinus, 8 to 18 on each side from the sublingual 

 glands, near the frenum of the tongue. The longest is the Duct of 

 Bartholine, which opens into the duct of Wharton. 



Where are the Salivary Glands ? The Parotid Gland 1 lies below and 

 in front of the external ear, the Sub-maxillary 3 and Sub-lingtial^ Glands 

 lie in the corresponding fossae on the inner surface of the inferior maxillary 

 bone. [See Fig. 66.] 



Describe the Tongue. The tongue consists of extrinsic and intrinsic 

 muscles, a hyo-glossal membrane and a mucous membrane, a median fibrous 

 septum, vessels and nerves. Its Base is attached to the hyoid bone, the epi- 

 glottis, the soft palate and the pharynx. Its Under Surface 'is attached to the 

 hyoid bone and the inferior maxillary. Its mucous membrane is reflected 

 over the floor of the mouth to the inner surface of the gums, forming in front 

 a fold, the Frenum Lingua, 



The Tongue presents 



Filiform Fapillce, along its sides, closely packed in rows. 

 fungifortn Papilla, 2 scattered over the anterior two-thirds of its dorsum. 

 Circumvallate Papilla?- 7 to 12 in number, in two rows, forming a V at 

 the base of the tongue, meeting at the Foramen Cacum, which contains 

 the central papilla. FIG. 67. 



Follicular Glands, posteriorly to the circum- 



vallate papillae. 



Racemose Glands, over the dorsum, sides, and 

 under surface. Beneath the tip they form 

 two small oblong masses. 



Extrinsic Muscles, are the stylo-, hyo-, genio- 

 hyo-, and palato-glossus muscles. [See pp. 



73, 74-] 



Intrinsic Muscles, are the several fibres of the 

 lingualis muscle, superior, inferior, trans- 

 verse and perpendicular. 

 Name the Arteries of the Tongue. They 



are the 



f.ingual, branch of the external carotid, with its 

 branches, the 



Dorsal is linguae. Sub-lingual. Ranine. 

 Sub-mental, branch of the facial, anastomoses 



with the sub-lingual. 

 Ascending Pharyngeal, branch of the external carotid, sends some small 

 branches to the pharynx and tongue. 

 J 



