JAWS 



431 



where the brain is exposed, but it is pierced by several holes or 

 foramina (singular foramen) for the passage of nerves and other 

 structures, some of the more important of these are shown in 

 Figs. 337 and 338, and in Table V. 



unc 



Z2/.S. 



e.a.TTu 



ex.oc. 



y.m. 



S.OC. 



Fig. 341. — A ventral view of the skull of a rabbit. 



»/ , External process of the alisphenoid ; b.oc, basioccipital ; b.sp., basisphenoid ; e.a.m., external auditory 

 meatus ; ex.oc, exoccipital ; f.m., foramen magnum ; inc., incisors ; ju., jugal ; mr., molars ; mx., 

 maxilla ; oc. occipital condyle ; peri., periotic ; pi., palatine ; pm., premaxilla ; pmr., premolars ; 

 pr.sp., presphenoid ; pt., pterygoid ; s.oc, supraoccipital ; ty.b., tympanic bulla ; v., vomer ; zy.mx., 

 zygomatic process of maxilla ; zy.s.. zygomatic process of squamosal. 



The teeth are described more fully below, but it is appropriate 

 here to give their names, since these depend on the bones which 

 bear them. In mammals the teeth are thecodont, or embedded 

 in sockets in the bone. In the upper jaw those borne in the 

 premaxilla are incisors ; in the premaxilla-maxilla suture or 

 immediately behind it there is on each side a single canine or 



