THE SUBMAXILLARY GLAXD. 619 



ttachnient of the internal lateral ligament of the jaw, this small 

 lerve joins the lingual at an acute angle, about three-quarters of 

 11 inch below the skull. At the point of meeting a communi- 

 lation takes place with the lingual, but the greater part of the ends in 

 horda tympani is merely conducted along that nerve to the to 

 ongue. 



The origin of this nerve, and its course across the tympanum, 

 vill be described in Chapter XII. 



The nei've to the internal pterygoid can now be seen as it passes Branch to 

 leneuth the hinder border to the inner surface of its muscle, but 

 t will be more fully shown in the dissection of the otic ganglion. 



SECTION VIII. 



SUBMAXILLARY REGION. 



The submaxillary region is situate between the lower jaw and parts in it. 

 he hyoid bone. In it are contained some of the muscles of the 

 ivoid bone and tongue, the vessels and nerves of the tongue, and 

 he sublingual and submaxillary glands. 



Position. In this dissection the position of the neck is the same Position of 

 is for the examination of the anterior triangle. 



Dissection. If any fatty tissue has been left on the submaxillary Dissection, 

 gland, or on the mylo-hyoid muscle, when the anterior triangular 

 *pace was dissected, let it be taken away. 



The SUBMAXILLARY GLAND (fig. 213, u , p. 589) lies below the jaw in Submaxii- 

 he anterior part of the space limited by that bone and the digastric lary gland ' 

 muscle. Somewhat oval in shape, it rests on the mylo-hyoid, and S1 

 ends a deep process round the posterior or free border of that and 

 nuscle. In front of it is the anterior belly of the digastric ; and re 

 >ehind is the stylo-maxillary ligament separating it from the 

 )arotid. The gland is covered only by the integuments, platysma, 

 and deep fascia ; and the facial artery winds forwards on its deep 

 surface. 



In structure the submaxillary resembles the parotid gland and its structure 

 luct duct of Wharton issuing from the deep process, extends and duct ' 

 beneath the mylo-hyoid muscle to the mouth. 



Dissection. To see the mylo-hyoid muscle, detach the anterior Dissection, 

 belly of the digastric from the jaw, and dislodge without injury the 

 submaxillary gland from beneath the bone. 



The MYLO-HYOID MUSCLE is triangular in shape, with the base at Mylo-hyoid 

 the jaw and the truncated apex at the hyoid bone, and unites along 

 the middle line with its fellow of the opposite side. It arises from arises from 

 the rnylo-hyoid ridge on the inner surface of the lower jaw as far-' aw; 

 back as the last molar tooth ; and its posterior fibres, including about inserted 

 a third of the muscle, are inserted into the front of the body of the {J^ 11 ^ 

 hyoid bone, whilst the remainder blend \\ith those of the muscle of raphe; 



