THE PAROTID GLAND. 



815 



Its outer surface is convex and lobulated, and is covered by the skin and 

 fascia, and partially by the platysma muscle. It is bounded above by the 

 zygoma, below by a line drawn backwards from the lower border of the jaw 

 to the sterno-mastoid muscle, and behind by the external meatus of the ear, 

 the mastoid process, and sterno-mastoid muscle. Its anterior border, which 

 lies over the ramus of the lower jaw, is less distinctly defined, and stretches 

 forwards to a variable extent on the masseter muscle. It is from this 

 anterior border of the gland that the excretory duct passes off ; and there is 



Fig. 572. 



Fig. 572. SKETCH OF A SUPERFICIAL DISSECTION OP THE FACE, SHOWING THE POSITION 

 OF THE PAROTID AND SDBMAXILLARY GLANDS, f 



p, the larger part of the parotid gland ; p", the small part, which lies alongside the duct 

 on the masseter muscle ; d, the duct of Stenson before it perforates the buccinator 

 muscle ; a, transverse facial artery ; n, n, branches of the facial nerve emerging from 

 below the gland ; f, the facial artery passing out of a groove in the submaxillary gland 

 and ascending on the face ; s m, superficial larger portion of the submaxillary gland lying 

 over the posterior part of the mylo-hyoid muscle. 



frequently found in connection with the duct, and lying upon the masseter 

 muscle, a small process or a separated portion of the gland, which is called 

 glandula soda (soda parotidis). On trying to raise the deeper part of the 

 parotid gland from its position, it is found to extend far inwards, between 

 the mastoid process and the ramus of the jaw, towards the base of the skull, 

 and to be intimately connected with several deep-seated parts. Thus, above, 

 it reaches into and occupies the posterior part of the glenoid cavity ; behind 

 and below, it touches the digastric muscle, and rests on the styloid process 



