Fig. 30. — Sections of orthognathous (light contour) 

 and prognathous (dark contour) skulls, one-third of the 

 natural size, a 6, Basicranial axis ; J) c, 1/ c', plane of the 

 occipital foramen; del', hinder end of the palatine bone; 

 ee', front end of the upper jaw; T T', insertion of the 

 tentorium. 



