BONES OF THE SKULL. 



117 



pital behind, and to the frontal before, whilst the temporal bones 

 form the buttresses of this arch, overlapping in a spliced manner 



Fig. 79. 



Fig. 80. 



the lower border of the parietals, to prevent that portion being 

 thrust outwards. The same mechanical provision prevents 

 the temporal bones from 

 being driven inwards by 

 blows given on the tem- 

 poral region. 



Fig 80 shews the Fron- 

 to-temporal portion of the 

 frontal bone (os frontis], 

 bounded below by the 

 frontal prominences (1,1), 

 and above by the suture 

 by which it is connected 

 with the parietals. 4, 4, 

 are the temporal arches ; 

 5, 5, the temporal fossae, 

 in which the temporal 

 muscles are lodged; 10, 

 10, the superciliary arches ; 11, 11, the supra-orbital holes 

 through which the nerves of that name pass. 



