SKELETAL SYSTEM 377 



the pieces of bone must be brought back into position 

 (this is called "setting" the bone), and must be held 

 there by splints until the ends have become firmly 

 knitted together. It is essential that the bone be kept 

 quiet until the ends have "knitted." 



Sometimes a bone in moving slips out of place. This 

 is a dislocation. Parts of the ligaments are sometimes 

 torn, and the bone may or may not be dislocated. Such 

 an accident is a sprain. This is often very painful, slow 

 to heal, and should be treated with care. 



Questions 



1. Of what use are the bones? 



2. What are the three parts of the skeleton? 



3. On your head locate the two parts of the skull. 



4. Describe the structure of the vertebral column. 



5. How many ribs are there? To what are they 

 attached? 



6. Name the bones in the upper limb. In the lower 

 limb. 



7. How does the arrangement of the bones in the 

 arm differ from that in the leg? 



8. Give the composition of bone. 



9. Discuss the growth of bone. 



10. Describe a joint. 



11. Why should not a heavy strain be put upon the 

 bones of children? 



12. What is meant by : rickets, fracture, disloca- 

 tion, sprain? 



