26 



Bones of the Skull. 



Squama frontalis 



Lamina perpendicularis 

 ossis ethmoidalis 



Corpus ossis 

 sphenoidalis 



Os nasale 



Ala vomeris 



jConcha 

 nasalis 

 inferior 



Groove for the 

 attachment of the 



lamina 



perpendicularis 



ossis ethmoidalis 



and the cartilago 



septi nasi 



Ala vomeris 



Lamina medialis processus 

 pterygoidei ossis sphenoidalis 



Vomer 



Processus palatinus maxillae 



32 and 33. Plough -share bone, vomer. 



From the left. From in front. 



The vomer (plough-share bone} (see also Fig. 75) is an unpaired, oblong, quadrangular, 

 flat bone which lies in the median plane and forms the posterior part of the nasal septum. 

 It is usually bent somewhat to one side, but never at its posterior margin. Its upper margin 

 is broad and is split into two thick laterally directed leaves (alae vomeris), each of which is 

 attached by its free margin to the proc. vaginalis of the proc. pterygoideus oss. sphenoidalis 

 and to the proc. sphenoidalis oss. palatini. The two wings of the vomer leave a groove between 

 them in which is placed the rostrum sphenoidale. The posterior margin is smooth, thin and 

 lies free. The inferior margin is sharp and serrated, and adjoins the crista nasalis of the 

 united palate bones and upper jaw bones. The anterior margin, which is also the upper, is 

 somewhat thickened and hollowed out to form a groove; it unites behind with the inferior 

 margin of the perpendicular plate of the ethmoid bone, in front with the cartilaginous 

 nasal septum. 



