v///: >.i/./r.i/;r GJ^ANl - 369 



fi't-if Canal. Wlnii-t<>ii'# //, as it is termed, is long and narrow ; 

 has \i TV alti limited walls, and exists for nearly the whole length of the 

 superior hurdcr of the gland : sometimes OD its internal faei-. v, hi iv it receives 

 tin nullifications from various lobules. At the anterior extremity of the 

 :i it becomes free, and passes forward between the mylo-hyoideus and 

 liasin- i hyo-) glossus muscles. After crossing., outwardly, the glosso-facial 

 artery and great hypogloesal nerve, and, inwardly, the tendon of the digas- 

 trieus and the lingual nerve, it passes between the hyo-glossus longus and 

 the siiblingual gland, lying closely to the inner side of the latter; thus it 

 extends parallel to the lateral groove (or channel) of the lingual canal (on 

 the iloor of tho mouth). It finally arrives near the fraenum of the tongue, 

 but underneath the buccal membrane, and opens into the mouth by a small, 

 but very salient, floating tubercle, situated a little in advance of the frrcuum, 

 and vulgarly named the barb (barbillon). 



The structure of Wharton's duct is identical with that of Steuon, but its 

 external tunic is extremely thin, and has not any circular elastic fibres. 



3. Sublingual Gland. (Fig. 173.) 



This is less in volume than the preceding, and is situated under the 

 tongue, in the intermaxillary space. 



Elongated from before to behind, and very flat laterally, it has, like 

 tin- gubmaxillary gland, two faces, two borders, and two extremities, whose 

 relations we will briefly indicate. 



The external face is covered by the mylo-hyoideus muscle ; the internal 

 responds to Wharton's duct and the genio-glossus and hyo-glossus longus 

 muscles. The upper border projects beneath the mucous membrane on the 

 floor of the mouth, where it forms the sublingual ridge; the inferior, thin 

 and sharp, is comprised between the mylo-hyoideus and the genio-glossus 

 muscles. The tic<> o-//, //////<$ are thin and tapering; the posterior contains 

 a branch of the lingual nerve ; the anterior extends to the bottom of the 

 angle formed by the union of the two branches of the inferior maxilla. 



Vessels and nerves. This gland possesses a special, but small artt ry~ the 

 fitilifinyittil Its nerves come from the lingual nerve, and even from the 



,-_// i-miiilx. These number fifteen or twenty, and are named tho 



ilix-tiis liir'tii'miii. Flexuous and very slender, they arc detached from tho 



superior border or internal face of the gland, ascend ju-rj endicuhirly. and 



into the mouth on tho sublingual crest or ridge by a linear series 



of small orifices pierced, as usual, in the centre of a tubercle. 



4. Molar Glands. 



These are so named because they ore disposed parallel to tho molar arches. 

 There are two on each s 



The superior molar gltnul, tho most considerable, represents a narrow 

 line, of salivary lobules placed outside, and along the up|K.-r lender of, tho 

 in-labialis muscle. In its posterior part, when it is concealed beneath 

 the mass trr muscle, this gland is thicker an I more compact than in front, 

 where the few lobules which compose it scarcely come in contact with each 

 other. 



Tho inferior mnJnr <//</</, less lobultitcd and voluminous, and not so 

 ;.s the preceding, is placed at the inferior Inmler of tin- buceii. 

 liately beneath the mucous membrane of the mouth, and nc,ar tho 



2 B 



