SUBMAXILLARY REGION 



287 



the body of the hyoid bone. Its fibres pass upwards to the 

 posterior part of the side of the tongue, medial to the stylo- 

 glossus. The hyoglossus -is supplied by the hypoglossal 

 nerve. 



Musculus Stylo-glossus. The stylo-glossus muscle is an 

 elongated fleshy slip which takes origin from the anterior aspect 

 of the styloid process near its tip, and, to a slight extent, from 

 the upper part of the stylo-hyoid ligament also. Passing down- 

 inferior meatus of nose 

 Maxillary sinus 



Tongue 



sublingual gla 

 Submaxilla: 

 duct 



Lingual nerve- 



Great posterior 

 palatine artery 

 and nerve 

 Vestibule of 

 mouth 



Buccinator 



Arteria profund; 

 linguae 



Sublingual glanc 



Inferior alveolar 

 irtery and nerve 

 n the mandibular 



canal 

 Mylo-hyoid 



Genio-glossus 



Genio-hyoid 



Platysma 



Anterior belly of digastric 



FIG. 117. Frontal section through the Closed Mouth in the plane 

 of the second molar teeth. 



wards and anteriorly its fibres may be traced upon the side 

 of .the tongue as far as the tip. Some of them decussate 

 with the fasciculi of the hyoglossus muscle. The nerve of 

 supply to the stylo-glossus comes from the hypoglossal. 



Musculus Geniohyoideus. The genio-hyoid muscle is 

 placed close to the median plane, in contact with its fellow of 

 the opposite side. It is a short muscle which arises from 

 the spina mentalis upon the posterior surface of the symphysis 

 of the mandible, and extends downwards and posteriorly to 

 gain insertion into the anterior aspect of the body of the 

 hyoid bone. The hypoglossal nerve supplies the genio-hyoid. 



