SKULL 



125 



regions, continuous with one another and with the nasal septum. 

 Side walls are also partly formed by the chondrocranium, but are 



FIG. 90B. LONGITUDINAL VERTICAL SECTIONS THROUGH THE SKULLS OF A, DEER, 

 B, BABOON. AND C, MAN, TO SHOW THE RELATIONS BETWEEN THE CRANIAL 

 AND XASAL PORTIONS. 



considerably fenestrated. The occipital region includes the 

 equivalents of four vertebra^. 



