498 SUB3I AXILLARY SUBLINGUAL GLAND." 



the sterno-mastoid muscle. Embedded in its substance are the 

 external carotid artery, temporo-maxillary vein, and facial nerve ; 

 and, emerging from its anterior border, the tranverse facial artery 

 and branches of the pes anserinus ; and above, the temporal artery. 



The duct of the parotid gland (Stenon's* duct) commences at the 

 papilla upon the internal surface of the cheek, opposite the second 

 molar tooth of the upper jaw ; and, piercing the buccinator muscle, 

 crosses the masseter to the anterior border of the gland, where it 

 divides into several branches, which subdivide and ramify through 

 its structure, to terminate in the small cascal pouches of which the 

 gland is composed. A small branch is generally given off from the 

 duct while crossing the masseter muscle, which forms, by its rami- 

 fications and terminal dilatations, a small glandular appendage, the 

 socia parotidis. Stenon's duct is remarkably dense and of con- 

 siderable thickness, while the area of -its canal is extremely small. 



The Submaxillary gland is situated in the posterior angle of the 

 submaxillary triangle of the neck. It rests upon the hyo-glossus 

 and mylo-hyoideus muscles, and is covered in by the body of the 

 lower jaw and by the deep cervical fascia. It is separated from 

 the parotid gland by the stylo-maxillary ligament, and from the 

 sublingual by the mylo-hyoideus muscle. Embedded among its 

 lobules is the facial artery and the submaxillary ganglion. 



The Excretory duct (Wharton's) of the submaxillary gland com- 

 mences upon the papilla, by the side of the fraenum linguae, and 

 passes backwards beneath the mylo-hyoideus and resting upon the 

 hyo-glossus muscle, to the middle of the gland, where it divides into 

 numerous branches, which ramify through the structure of the gland 

 to its cascal terminations. It lies in its course against the mucous 

 membrane forming the floor of the mouth, and causes a projecting 

 ridge upon its surface. 



The Sublingual is an elongated and flattened gland, situated be- 

 neath the mucous membrane of the floor of the mouth, on each 

 side of the fraenum linguae. It is, in relation above with the mucous 

 membrane; in front with the depression by the side of the symphy- 

 sis of the lower jaw ; externally with the mylo-hyoideus muscle ; 

 and internally with the lingual nerve and genio-hyo-glossus muscle. 



It pours its secretion into the mouth by seven or eight small ducts, 

 which commence by small openings on each side of the franum 

 linguae. 



Structure. The salivary are conglomerate glands, consisting of 

 lobes, which are made up of angular lobules, and these of still 

 smaller lobules. 



The smallest lobule is apparently composed of granules, which 

 are minute cascal pouches, formed by the dilatation of the extreme 

 ramifications of the ducts. These minute ducts unite to form lobu- 



* Nicholas Stcnon, an anatomist of great research. He discovered the parotid duet 

 while in Paris. He was appointed professor of medicine in Copenhagen in 1672. His 

 work, " De Musculis et Glaiululis Ohservaliones," was published in 16G4. 



