418 SPLANCHNOLOGY, OR ANATOMY OF THE VISCERA 



tabulated, is covered by the skin and fascia, and partly by the 

 platysma and several lymphatic glands; in front it runs over 

 the masseter, is grooved for the ramus of the lower jaw, and 

 extends beneath it, between the two pterygoids; above it is 

 bounded by the zygoma; below, by the angle of the jaw and a 

 line joining it with the mastoid process; behind, by the external 

 meatus, mastoid process, and sternomastoid. The internal 

 surface sends two processes into the neck one behind the 

 styloid process and beneath the mastoid process and sterno- 

 mastoid; another in front of the styloid process, into the back 

 of the glenoid cavity behind the jaw. Embedded in the gland 

 are found the external carotid, posterior auricular, temporal, 

 transverse facial, and internal maxillary arteries, the temporo- 

 maxillary vein and a branch from it to the internal jugular, 

 the facial nerve with its branches, and the auriculotemporal 

 and great auricular nerves. The internal carotid artery and 

 internal jugular vein lie under its deep surface. 



The duct (Stenson's) is about 2J inches long and J inch 

 in diameter, and opens opposite the second molar tooth, thence 

 runs backward beneath the mucous membrane, through the 

 buccinator, and across the masseter to the front of the gland. 

 It commences by numerous branches, and on the masseter 

 receives the duct of a detached part of the gland, the soda 

 parotidis, which sometimes is found beneath the zygomatie 

 arch. Its epithelium is columnar. 



The submaxillary gland is of an irregular form, weighs about 

 2 drams, and lies below the jaw and above the digastric muscle. 

 It is covered by the skin, platysma, and fascia', and grooves 

 the inner surface of the lower jaw. It lies on the mylohyoid 

 (partially embracing this muscle), hyoglossus, and styloglossus, 

 and has in front of it the anterior belly of the digastric. Behind, 

 the stylomaxillary ligament separates it from the parotid, 

 and the mylohyoid (its superficial part) from the sublingual 

 gland in front. The facial artery grooves its upper and back 

 part. 



The sub maxillary duct (Wharton's) is 2 inches long, and 

 opens at the top of a papilla close to the frenum linguae. Thence 

 it runs back between the sublingual gland and the geniohyo- 

 glossus, then between the mylohyoid and the hyoglossus and 

 geniohyoglossus. 



The sublingual gland, the smallest of the salivary glands, 



