u8 



THE SKULL 



[chap 



end of the alveolar" border of the maxilla projects back- 

 wards, so as to form a partial floor to its anterior extremity. 



EarO 

 BO, 





PMx 



Fig. 47.— Under surface of the cranium of a Dog, \. SO supraoccipital : ExO 

 exoccipital ; BO basioccipital ; Per mastoid portion of periotic ; Ty tympanic 

 bulla; BS basisphenoid ; Sq zygomatic process of squamosal; Ma malar; AS 

 alisphenoid ; Ft pten goid ; PS presohenoid ; Fr frontal ; Vo vomer ; PI palatine ; 

 Mx maxilla ; PMx premaxilla ; fin foramen magnum ; oc occipital condyje ; 

 ftp paroccipital process ; cf condylar foramen ; flp foramen lacerum posterius : svi 

 stylo-mastoid foramen ; earn external auditory meatus ; pgf postglenoiri foramen : 

 gp postglenoid process ; gf glenoid fossa ; flm foramen lncerum medium;^ 

 foramen ovale ; as posterior opening of alisphenoid cand ; fr foramen rotundum 

 and anterior opening of alisphenoid canal : sf sphenoidal fis-ure or foramen 

 lacerum anterius ; op optic foramen ; /^/posterior palatine foramen ; apf 'anterior 

 palatine foramen. 



In front of the orbits the face is formed above by the 



