292 HEAD AND NECK 



also to the muscular substance of the organ, and a few may 

 be traced backwards into the tonsil. 



Arteria Sublingualis. This springs from the termination 

 of the second part and emerges from under cover of the 

 anterior border of the hyoglossus, and then ascends upon the 

 genio-glossus to reach the sublingual gland, which it supplies. 

 It gives branches to the surrounding muscles also ; and 

 it anastomoses with its fellow of the opposite side and with 

 the submental branch of the external maxillary artery. 



Arteria Profunda Lingua. The deep artery of the tongue 

 ascends almost vertically upon the genio-glossus, overlapped 

 by the anterior border of the hyoglossus ; when it reaches 

 the under surface of the tongue, it runs towards the tip and 

 ends in terminal branches. It can easily be exposed by 

 dividing the mucous membrane along its course, when it will 

 be seen to lie close to the attachment of the frenulum of 

 the tongue, and to be continued forwards in the interval 

 between the genio-glossus and the inferior longitudinal 

 muscle. Its course is tortuous to allow of the protrusion or 

 elongation of the organ, and it gives off numerous branches. 



Lingual Veins. The lingual artery is accompanied by 

 two small venae comites which lie with it under cover of 

 the hyoglossus ; but the main vein of the tongue crosses 

 the lateral surface of the hyoglossus, and another smaller vein, 

 the vena comitans hypoglossi, accompanies the hypoglossal 

 nerve. The venae comites of the artery and the vena comitans 

 hypoglossi unite with the main vein to form the lingual vein, 

 which opens into the common facial vein or into the internal 

 jugular vein. 



Stylo-hyoid Ligament. This is the last structure to be 

 examined in this dissection. It is a fibrous cord which 

 springs from the tip of the styloid process and passes 

 antero-inferiorly to be attached, under cover of the hyo- 

 glossus muscle, to the lesser cornu of the hyoid bone. It is 

 not uncommon to find it partially ossified ; in other cases 

 it may assume a ruddy hue and contain muscular fibres. 



OTIC GANGLION AND TENSOR PALATI. 



During the dissection of the submaxillary region the 

 dissector has noted a nerve ganglion, the submaxillary ganglion^ 

 connected with the lingual branch of the mandibular nerve, 



