BONES OF THE SKULL. 



121 



The nead is almost 

 in equilibrium on the 

 condyles (16, 16), but 

 that portion situated 

 in front of the joint 

 ivier than that 

 placed behind it, 

 hence it overweighs 

 the latter : this ne- 

 cessitates the presence 

 of more powerful 

 muscles in the pos- 

 terior region of the 

 leek, to maintain the 

 head erect upon the 

 spinal column; when 

 these become relaxed, 

 as in sleep, the head 

 falls forward upon the 

 chest. 



[ 246. The sphe- 

 noid and ethmoid 

 bones, Fig. 91 (1,2), 

 are wedged between 

 the cranial bones at 

 the base of the skull, 

 and may be said to be 

 common to the cra- 

 nium and the face. 



[ 247. The face is 

 formed by the union 

 of fourteen different 

 shaped bones, which 

 form five large cavi- 2 

 ties for lodging the 

 organs of vision, smell, 

 and taste. All the 

 bones of the face, the 

 lower jaw excepted, 

 are completely im- 

 moveable, and firmly 

 united to each other 



Fig. 90*. 



