THE HEAD AND NECK. 



107 



lage and lubricated with synovial fluid, allow the 

 head to move freely up and down, or sideways, even 



Fig. 15. — Side view of the skull of man, with the 

 bone removed so as to show the whole of the teeth. 

 z, zygomatic arch ; n, nasal bone ; o, or it ; t, tem- 

 poral fossa ; oc, occipital condyle ; e, external audi- 

 tory opening; g, glenoid fossa for articulation of 

 the lower jaw ; c, coronoid process of lower jaw ; 

 i 1 and i~, incisor teeth; ceo, canine; pm 1 andjw* 2 , 

 premolar teeth; m 1 , m 2 , and m?, the three molar 

 teeth. 



when the neck is fixed. The same region also shows 

 various roughened, projecting ridges or promontories 

 for the attachment of the powerful ligaments and 



