162 



HEAD AND NECK 



the mastoid process, the posterior belly of the digastric, the 

 styloid process, and the stylo- hyoid muscle. The space 

 extends upwards to the external acoustic meatus, and it is 

 prolonged downwards into the carotid triangle, into which 

 the lower extremity of the gland descends, for a short 

 distance, beyond the angle of the mandible. The gland, 

 however, is more extensive than the space and passes for a 

 varying distance forwards, beyond the anterior border of the 



1. Posterior facial vein 



2. M. sternomastoideus 



3. M. digastricus 



4. Accessory nerve 



5. Internal jugular 



6. M. stylohyoideus 



7. Glossopharyngeal //fe (H'W^ ,*'lV^ labl1 supenons 



nerve 



Maxillary sinus 



M. zygomaticus 

 M. buccinatorius 

 M. temporal is 



Palatine tonsil 



Inferior alveolar vessels 

 and nerve 



Pharynx 



-M. stylopharyngeus 

 M. styloglossus 

 Internal carotid 

 Sympathetic 

 r agus and Hypoglossal 



12 34567 



FIG. 59. Transverse section through the Head at the level of the Hard 

 Palate. It shows the relations of the parotid gland, etc. 



space, over the superficial surface of the masseter (Figs. 4, 58). 

 In accordance with the position which it occupies the 

 gland may be described as possessing four surfaces, two 

 extremities, and four borders. The surfaces are superficial 

 or lateral, postero-medial, antero-medial, and superior; the 

 extremities, upper and lower ; the borders, anterior, posterior, 

 medial, and superior. The medial border separates the 

 antero-medial from the postero-medial surface. The anterior 

 and posterior borders separate the lateral surface from the 



