CHAP. X.] 



THE SKULL OF MAN. 



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

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

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

 turbinal ; ET ethmo-turbinal ; ME ossified portion of the mesethmoid ; No. nasal ; 

 eg crista galli of the mesethmoid ; OS orbitosphenoid, or lesser wing of the 

 sphenoid; AS alisphenoid, or greater wing of the sphenoid ; Fr frontal; Pa 

 parietal; SO supraoccipital ; M mastoid portion of the periotic ; Sq 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. ExO exoccipital, the line points to the condylar fora- 

 men ; fm foramen magnum ; BO basioccipital ; BS basisphenoid ; st sella turcica ; 

 PS presphenoid, ankylosed with the basisphenoid, forming the "body of the 

 sphenoid ; " Pt pterygoid ; PI palatine ; Vo vomer ; MX maxilla ; j symphysis of 

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

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

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



