562 SUBMAXILLARY GLAND. SUBLINGUAL GLAND. 



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 caecal 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 ramifications and 

 terminal dilatations, a small glandular appendage, the socia parotidis. 

 Stenon's duct is remarkably dense and of considerable 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 are the facial artery and 

 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 caecal 

 terminations. It lies in its course against the mucous membrane 

 forming the floor of the mouth, and causes a prominence of that 

 membrane. 



The Sublingual is an elongated and flattened gland, situated beneath 

 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 symphysis of the lower 

 jaw ; externally with the mylo-hyoideus muscle ; and internally with 

 the hypoglossal 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 fraenum 

 linguae. 



Structure. The salivary are conglomerate glands, consisting of 

 lobes, which are made up of polygonal lobules, and these of still smaller 

 lobules. 



The smallest lobule is apparently composed of granules, which are 

 minute csecal pouches, formed by the dilatation of the extreme ramifi- 

 cations of the ducts. These minute ducts unite to form lobular ducts, 

 and the lobular ducts constitute by their union a single excretory 

 duct. The caecal pouches are connected by areolar tissue, so as to 

 form a minute lobule ; the lobules are held together by a more con- 

 densed .areolar layer ; and the larger lobes are enveloped by a dense 

 cellulo-fibrous capsule, which is firmly attached to the deep cervical 

 fascia. 



hagen in 1672. His work, " De Musculis et Glandulis Observationes, " was 

 published in 1664. 



