CHAP. X.] 



THE SKULL OF MAN. 



; 



FIG. 53. Vertical, longitudinal, median section of a young human skull, with the first 

 dentition. J. As in the other sections of a skull figured, the mandible is displaced 

 downwards, so as to show its entire form. PMx premaxilla ; MT maxillo- 

 turbinal ; KT ethmo-turbinal ; .I/A" ossified portion of the mesethmoid ; Na nasal ; 

 eg crista galli of the mesethmoid; OS prbttosphenoid. or lesser wing of the 

 sphenoid ; AS alisphenoid. or greater wing of the sphenoid ; /> frontal ; /'a 

 parietal ; SO supraoccipital ; M inastoid portion of the periotic ; Sy squamosal; 

 Per petrous portion of the periotic : the large foramen below the end of the line 

 is the internal auditory meatus. the small depression above it is the nearly- 

 obliterated floccular fossa. E.\O exoccipital, the line points to the condylar fora- 

 men \ _fm foramen magnum ; HO basioccipital ; BS basisphenoid ; it sella turcica ; 

 /'.V presphenoid. aiikylosed with the basisphenoid, forming the " body of the 

 sphenoid ;" /'/ pterygoid ; PI palatine ; Vo vomer ; MX maxilla ; i symphysis of 

 mandible ; cp coronoid process ; cd articular condyle ; a angle ; ih stylohyal, or 

 ' styloid process of temporal;" ch ceratohyal, or lesser cornu of hyoid ; bk 

 basihyal, or body of hyoid ; tk thyrohyal, or greater cornu of hyoid. 



