CHAP. IV.] 



THE SKELETON. 



31 



The frontal bone resembles a cockle shell in form. It not 

 only forms the forehead, but also enters into the formation of 

 the roof of the orbits, and of the nasal cavity. The arch formed 



FIG. 25. FRONTAL BONE. Outer surface. 1, frontal eminence; 7, roof of orbital 

 cavity ; 10, orbital arch. 



by part of the frontal bone over the eye is sharp and prominent 

 and affords that organ considerable protection from injury. At 

 birth the bone consists of two pieces, which afterwards become 

 united, along the middle line, by a suture which runs from the 

 vertex of the bone to the root of the nose. This suture usually 

 becomes obliterated within a few years after birth, but it occa- 

 sionally remains throughout life. 

 Flat bones of the face : 



Nasal 2 



Lachrymal -2 



Vomer 1 



5 



The two nasal bones are two small oblong 

 bones, varying in size and form in different in- 

 dividuals ; they are placed side by 

 side at the middle and upper part 

 of the face, forming by their junc- 

 tion "the bridge " of the nose. 

 FIG. 26. -NA- The lachrymal are the smallest 



SAL BONE. Outer 



surface. A, inter- and most fragile bones or the lace. FIG.-JT. LAC n- 

 nai border; B, They are situated at the front part KYMAI. Boir. 

 external border. J . Outer surface. 



of the inner wall or the orbit, and 

 resemble somewhat in form, thinness, and size, a finger-nail. 



