BONES OF THE FACE. 201 



The structure of these bones is entirely compact, very 

 thin, transparent, and among the most brittle of all the 

 bones. The development of each bone is by a single point 

 of ossification, which is said to be completed at the begin- 

 ning of the third month. The articulations are with four 

 bones, i. e. two of the cranium and two of the face. By its 

 superior and posterior edges it is united to the frontal and 

 ethmoid, and by its inferior and anterior edges to the 

 superior maxillary and lower turbinated bone. 



Nasal Bones (ossa-nasi.) The bones of the nose are 

 situated between the nasal processes of the superior maxil- 

 lary, and below the frontal. They are A - FlG - 

 two in number, and meet along the 

 median line, so as to form an arch 

 called the bridge of the nose. This 

 arch is thick and narrow above, where 

 it joins the frontal bone, and thin and 

 expanded below where it connects with 

 the cartilage. The external surface is 

 convex and covered by the pyramidalis 

 and compressor nasi muscles. The internal surface is con- 

 cave and receives the nasal branch of the ophthalmic nerve. 



The structure of the nasal bones consists of two compact 

 tables, with intervening diploe. Their development takes 

 place by a single point of ossification about the end of the 

 second month. The articulation is with four boneg, i. e. 

 the frontal and ethmoidal of the cranium, and the superior 

 maxillary and its fellow of the face. 



Inferior Turbinated Bones (ossa turbinata inferiora.) 

 (Fig. 49.) The inferior turbinated or spongy bones are 

 situated at the lower and outer part of the nares. Their 



FIG. 48, B represents an anterior view of the nasal bones. Inferior ex- 

 tremity. 5 Articulating surface for its fellow, c Articulating edge for the 

 superior maxillary bone, d Groove on inner side for nasal nerve, e Articu- 

 lating border for frontal bone. / Foramen for nutritious artery. 



FIG. 48, A represents a posterior view of nasal bones, a Inferior extremity 

 ft Articulating margin for its fellow, c Articulating margin for superior 

 maxilla, d Groove for internal nasal nerve, t Articular border for frontal 

 bone. / Lower portion of groove for the nasal nerve. 



