Bones of the Skull. 



25 



Union with the 

 pars nasalis ossis frontalis 



r ~i 



Os nasale 



Processus frontalis 

 maxillae 



Processus zygomaticus 

 maxillae 



Corpus maxillae 



Union with the /j -, 

 os nasale of the W J 



other side 



' 



Probe in one 

 foramen nasale 



Sulcus 

 ethmoidalis 



Probe in one foramen nasale 



3O and 31. Right nasal bone, os nasale. 



From without. From within. 



The os nasale (nasal bonej (see also Figs. 57, 58, 68, 73 75) is paired and forms 

 with that of the other side the root of the nose and the upper part of the back of the nose. 

 It is a small, oblong, quadrangular bone thicker and narrower above, thinner and broader 

 below. The nasal bones of the two sides are attached to one another by their medial, slightly 

 serrated borders to form the suturd inter nas alis ; the upper serrated border unites with the 

 margo nasalis of the pars nasalis oss. frontalis to form the sutura nasofrontalis ; the lateral, 

 somewhat Jbevelled margin forms with the anterior margin of the processus frontalis maxillae 

 the sutura nasomaxillaris ; the inferior, bevelled, irregularly serrated margin unites with the 

 lateral nasal cartilage and projects somewhat in front of it ; in the macerated skull, however, 

 it lies free and helps to bound the apertura piriformis. The anterior surface is smooth and 

 usually slightly curved like a saddle. The posterior surface in its upper portion is attached 

 from in front to the spina frontalis oss. frontalis; in its lower portion it is smooth and helps 

 to form the bony part of the anterior wall of the nasal cavity; there is seen also the sulcus 

 ethmoidalis (0. T. groove for nasal nerve) (for the n. ethmoidalis anterior). The nasal bone 

 is often perforated by one or several small openings, foramina nasalia, for blood-vessels. 



