BONES OF THE HEAD 



233 



The lower ends of the radius and ulna are jointed to eight 

 irregular bones called the carpals, and these eight carpals 

 are so joined as to permit of one sliding a little over the 

 surface of the other. This sUding gives some flexibility 

 to the Avrist, of which these bones form the support. 



In the ankle are seven irregular bones which correspond 

 to the carpals and are called the tarsals. One of these 

 tarsals is much larger than all the others, and forms the 

 heel. The tarsals are 

 less movable than the 

 carpals. 



Extending from the 

 wrist are five rela- 

 tively long bones 

 ■ called the metacar- 

 pals which form the 

 hand. In the foot the 

 instep is formed by 

 five similar bones 

 called the metatar- 

 sals. 



The fingers and 

 thumb are formed of 

 fourteen bones called 

 the phalanges. The thumb has only two phalanges, the 

 fingers three. In the foot, the toe bones are also called 

 the phalanges; the great toe showing two, the others three. 



Bones of the head. — The bones which form the head are 

 divided into two groups, those which form the brain box 

 being called the cranial bones, while those that make up 

 the face and jaws are called facial bones. The two together 

 constitute the skull. 



Fig. 92 — The skull ; 1, frontal bone ; 2, parietal 

 bone ; 3, occipital bone ; 4, temporal bone ; 5, 

 nasal bone ; 6, malar bone ; 7, superior maxil- 

 lary bone; 8, lacbrymal bone ; 9, inferior maxil- 

 lary bone. 



