350 MAMMALIAN ANATOMY 



VAEIATIONS IN THE MAXILLARY BONES. 

 VARIATIONS IN SIZE. 



The following measurements were taken on left maxillaries. 



The length of the alveolar border is the distance from the anterior 

 edge of the canine alveolus to the posterior border behind the molar 

 alveolus. 



The height of the bone is measured on the external surface from 

 the middle of the outer edge of the canine alveolus to the most elevated 

 part of the superior border of the nasal process. 



The width of the nasal or ascending process is its maximum 

 antero-posterior diameter ; it is found usually just below the lachry- 

 mal tubercle. 



The palatal width is the greatest transverse distance from the 

 posterior end of the median border of the horizontal plate to the 

 outer edge of the alveolar border, usually just behind the second 

 premolar tooth. 



The height of the malar process is the vertical distance from the 

 upper end of its posterior border to the alveolar border produced 

 backward. 



The lateral length of the orbital surface of the body is the distance 

 from the middle of the upper rim of the infraorbital foramen to the 

 extreme posterior tip of the malar process. 



The medial length of the orbital surface is the distance from the 

 same anterior point to the posterior medial angle. 



The width of the orbital surface is the distance between the poste- 

 rior medial angle of the surface and the posterior tip of the malar 

 process. 



The nasal width of the palatine process is measured on the superior 

 surface from the median posterior angle to the inner margin of the 

 infraorbital foramen. 



