II34 



A MANUAL OF ANATOMY 



Lumen of Alveolus 



Stylo-hyoid Ligament. — ^This is a narrow fibrous cord which is 

 attached superiorly to the tip of the styloid process, and interiorly 

 to the small cornu of the hyoid bone. Its direction is downwards 

 and forwards, and its lower extremity is covered by the hyo-glossus 

 muscle. It is liable to become ossified, more or less completely. 



Submaxillary Gland. — This gland is situated in the anterior part 

 of the submaxillary or digastric triangle. It consists of a large 

 superficial part and a small deep part. The superficial part supe- 

 riorly occupies the submaxillary fossa on the inner surface of the 

 body of the inferior maxilla, and inferiorly it is covered by the skin, 

 superficial fascia, platysma myoides, and deep fascia. The facial 

 vein descends over it. Its deep surface rests anteriorly upon the 

 mylo-hyoid muscle, with the intervention of the mylo-hyoid nerve 

 and submental branch of the facial artery ; and posteriorly upon 

 the hyo-glossus, and slightly upon the posterior belly of the di- 

 gastric and stylo-hyoid, muscles. The 

 superficial part is grooved at its upper 

 and back part by the facial artery, 

 which lies embedded in th'e gland. 

 Posteriorly the superficial part is related 

 to the cervical portion of the parotid 

 gland, from which it is separated by the 

 stylo-mandibular (stylo -maxillary) liga- 

 ment. The deep part of the gland is of 

 small size, and is continuous with the 

 superficial part at the posterior border 

 of the mylo-hyoid muscle. It lies under 

 cover of that muscle upon the hyo- 

 glossus, and is related to the sublingual 

 gland. 



The duct of the submaxillary gland 

 is known as Wharton's duct, and it 

 emerges from the deep aspect of the 

 superficial part of the gland close to 

 the posterior border of the mylo hyoid muscle. It is about 

 2 inches in length, and it passes inwards upon the hyo-glossus 

 muscle, lying beneath the deep part of the gland. In this situation 

 it has the submaxillary ganglion and lingual nerve above it, and 

 the hypoglossal nerve below it. After leaving the hyo-glossus 

 muscle, the duct lies upon the genio-hyo-glossus, and, passing 

 slightly upwards, it is crossed from above downwards by the 

 lingual nerve. Having passed beneath the sublingual gland, the 

 duct opens upon the floor of the mouth by a minute orifice, 

 which is situated on the summit of a papilla lying close to the 

 side of the frenum of the tongue. 



The submaxillary gland is enclosed in a capsule, which is derived 

 from the deep cervical fascia. 



Blood-supply. — ^The gland derives its blood chiefly from the cer- 

 vical part of the facial artery. 



Crescents of Gianiuzi 



THE 



Fig. 463. — Section of 

 Submaxillary Gland of 

 A Dog. 



