SUBMAXILLARY REGION 193 



and also from 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. It helps to depress the tongue and to 

 pull its anterior part backwards. 



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. It passes down- 

 inferior meatus of nose 

 Maxillary sinus 



Ton 



ublingual gland 

 Submaxillary \\ 

 d 



Lingual nerve 



M. genioglossus 



M. geniohyoideus 



Greater 

 palatine artery 

 and nerve 

 Vestibule of 

 mouth 



M. buccinatorius 



_____ Arteria profundz 

 " linguae 



Sublingual gland 



Inferior alveolar 

 artery and nerve 

 in the mandibula 

 canal 

 M. mylohyoideus 



Platysma 

 M. digastricus (anterior belly) 



FIG. 72. Frontal section through the Closed Mouth in the plane 

 of the second molar teeth. 



wards and forwards, and its fibres may be traced upon the 

 side of the tongue as far as the tip. Some of them decus- 

 sate with the fasciculi of the hyoglossus muscle. It pulls 

 the tongue backwards, and its nerve of supply is derived from 

 the hypoglossal nerve. 



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 

 lower mental spine upon the posterior surface of the symphysis 

 of the mandible, and extends downwards and backwards to 



VOL. Ill 13 



