38 THE HUNAN BODY. 



which, forms part of the partition between the two 

 nostrils. 



The paired face bones are : 1. The maxillm or upper 

 jaw-bones, MX, which carry the upper teeth and form 

 most of the hard palate separating the mouth from the 

 nose. 2. The palate bones, completing the bony palate, and 

 behind which the nostril chambers communicate by the 

 posterior nares (Fig. 20) with the throat cavity, so that air 

 can pass in or out through them in breathing. 3. The 

 malar or cheeJc-hones, Z. 4. The nasal bones, N, roofing in 

 the upper part of the nose. 5. The lachrymal or tear- 

 bones, L, small and thin, lying between the eye-socket and 

 the nose. 6. The inferior turbinaie or spongy bones, which 

 lie inside the nose, one on the outer side of each nostril 

 chamber. 



The cranial sutures. All the bones of the skull, except 

 the lower jawbone, are immovably joined together. In the 

 case of most of the cranial bones this occurs by a dove- 

 tailing, like that used by cabinet-makers. Each bone has 

 its edges notched, and the notches fit accurately into hol- 

 lows on the bone it articulates with ; this kind of articula- 

 tion is called a suture ; it is well seen in Fig. 16, between 

 the parietal bone and those in front of, behind, and 

 below it. 



Comparison of the upper and lower limbs and their 

 supporting arches. The bones of these have already 



Name the unpaired face bones. 



Where does each lie? Name the paired face bones. State the 

 position of each in the skull. What bone carries tlie lower teeth? 

 Which the upper? What bones form the hard palate? By what 

 openings do the nose chambers communicate with the throat? Behind 

 what bone do these openings lie? 



What cranial bone is movable? How are most of the cranial 

 bones joined together? Describe a suture,?. 



