372 



MAMMALIAN ANATOMY 



FIG. 291. 



Frontal., 



Nasal. 



Upper Anterior part of 

 Ethmo-turbinal. ' 



Maxillo-turbinal. 



Premaxillary. 



Cut edge of Cribriform plate 

 of Ethmoid. 



Lower Posterior part 

 of Ethmo-turbinal 

 in Sinus. 



Vertical Longitudi- 

 nal Partition 

 .. ^ n Sphenoi- 

 '"^dnl Smws. 



Horizontal plates 

 of Maxillary 



Tomer. 



and Palatine. 

 RIGHT NASAL CHAMBER, SIDE VIEW FROM WITHIN. 



With Frontal. 



process. To the lower half of the anterior margin of the fossa and to 

 a part of the anterior edge of the remaining lower half of the internal 



surface itself, there is articu- 

 FlG - 292 - lated the front border of the 



Superior Border. 



nasal process of the maxillary. 

 The lower part of the surface 

 is overlapped by the nasal pro- 

 cess of the premaxillary. 



Nomenclature. Nasal 

 is from the Latin nasus, the 

 nose. Os nasale and os nasi 

 are also much used. The 

 French equivalents are I'os 

 nasal and I'os propre du nez. 

 The Germans employ das 

 Nasenbein. 



Determination. If the bone be held with the anterior surface 

 uppermost and the lower wider part away from the student, the 



With Maxillary. 



Fossa for Ethmo-turbinal. 



With Premaxillary. 

 Internal Angle. 



External Angle. 



LEFT NASAL BONE, OUTER SURFACE, SIDE VIEW. 



