380 



MAMMALIAN ANATOMY 



part is compressed from side to side. The side pieces are broad and 

 thin, and their anterior borders are hooked. 



The upper surface of the vomer (Fig. 297) is marked by a deep 

 longitudinal median furrow for the ethmoid and its cartilage. This 

 occupies all the surface at the anterior part of the bone, but behind, on 



FIG. 298. 



POSITION OF VOMER. MEDIAN SECTION. 



each side, where the bone widens out and is separated from the furrow 

 by a sharp ridge, is a well-marked slightly concave area, to which are 

 fastened the lower ends of some of the ethmoidal convolutions. The 



FIG. 299. 



With Nasal Process of Prnntnl. 



In Frontal Sinus. 



With Maxillary, j 



With Orbital Plate of 

 Frontal. 



With Palatine. 

 With Presphenoid. 



Free Lower Anterior Portion. 



Vomer. 



Os Planum. Vomer, with Maxillary. 

 THE ETHMOID AND VOMER, LEFT SIDE, OUTER SURFACE. 



anterior hook-like angles are fastened to the lower end of that plate 

 of the lateral ethmoid which forms the posterior boundary of the 

 ethmoidal cleft (Figs. 299, 300). 



The posterior end of the vomer, the end of the cross, is deeply 

 incised in the middle ; the two lateral projections are applied to the 

 anterior part of the inferior surface of the presphenoid. 



