286 



HEAD AND NECK 



deep part of the submaxillary gland and the submaxillary duct 

 (Wharton's) occupy an intermediate place. Although the 

 submaxillary ganglion is very minute, its relations are so 

 precise that it is very easily found. By seizing the lingual 

 nerve and dissecting carefully in the interval between it 

 and the deep part of the submaxillary gland, the ganglion 

 will be exposed, and its roots and branches of distribution 

 made out. Upon the genio - glossus, anterior to the 



Inferior nasal concha (O.T. inferior turbinal) 

 Internal pterygoid /" 



External pterygoid, I /Soft palate 



^MnLr**A4Cj 1 MBMHIH " ^Bi^MflMM I/I *.. h. '. . Mtm^^^MI^MJ 



Temporal mu; 



Stylo-glossus 



Inferior alveolar 



vessels and nerve 



Lingual nerve 



External 



maxillary artery 

 Superficial part of 

 ibmaxillary gland ~~ 

 Submaxillary duct 



Deep part of 

 submaxillary gland 

 Hypoglossal nerve 

 Lingual art 



Hyoglossus^ 

 Mylo-hyoi 

 Digastric tendon 



Genio-hyoid 



. Tongue 



Inferior alveo! 

 vessels and ne 

 in the mandib 

 ular canal 

 External 

 maxillary arte 



Did 



Lingual nerve 

 Deep part of 

 submaxillary gland 

 Submaxillary duct 

 Hypoglossal nerve 

 Lingual artery 

 x Digastric 

 Hyoglossus 



Genio-hyoid 



FIG. 1 1 6. Frontal section through the Tongue and Submaxillary Region 

 in a plane posterior to the molar teeth. 



hyoglossus, the dissector will note the sublingual gland with 

 its artery of supply. If the stylo-hyoid and the posterior 

 belly of the digastric are displaced posteriorly, certain 

 structures will be seen passing under cover of the posterior 

 margin of the hyoglossus muscle. These are: (i) the 

 glosso-pharyngeal nerve immediately below the stylo-glossus 

 muscle ; (2) the stylo-hyoid ligament a little lower down ; 

 and (3) the lingual artery close to the hyoid bone. 



Musculus Hyoglossus. This is a quadrate, flat muscle which 

 arises from the whole length of the greater cornu, and also from 



