166 HEAD AND NECK 



the postero-medial surface of the gland is separated from the 

 upper parts of the internal jugular vein and the internal 

 carotid artery, and from the last four cerebral nerves by the 

 posterior belly of the digastric, the styloid process and the 

 muscles attached to it. 



The medial border of the gland lies in the angle between 

 the postero-medial and the anterior boundaries of the parotid 

 space, where the styloid process, the stylo-hyoid muscle, and 

 the posterior belly of the digastric disappear under cover of 

 the posterior border of the internal pterygoid muscle ; and 



Anterior part of superior borde 

 Area for cartilage of external meatus 



Area for bone of external meatu 

 Posterior part of superior border 



Mastoid area --3^^m 

 Styloid area ~.\ * 

 Facial nerve -4s-Sgft 



Posterior auricular artery _^J 

 Ridge between digastric 

 and sterno-mastoid areas I 



External carotid artery 



I 

 I 



Posterior border-' 

 Sterno-mastoid groove 



Posterior facial vein 

 FIG. 6 1. Parotid Gland, postero-medial aspect. 



from it a process, the pterygoid lobe, usually projects forwards, 

 for a short distance, between the internal pterygoid and the 

 medial surface of the ramus of the mandible. Through the 

 base of that process the external carotid passes from the 

 postero-medial to the antero-medial surface of the gland. 



The antero-medial surface. The medial part of the 

 antero-medial surface is directed forwards and lies in relation 

 with the lower part of the posterior border of the internal 

 pterygoid, the stylo-mandibular ligament, and the posterior 

 border of the ramus of the mandible. The more lateral part is 

 directed medially and rests against the lateral surface of the 

 masseter. The antero-medial surface is pierced (i) by the 

 external carotid artery, (2) the posterior facial and the internal 



