THE SKELETON 8 1 



17. When the palm is turned upward is the radius parallel or crossed 

 with the ulna? When the back of the hand is up? 



1 8. Why should one always sit and walk erect? 



19. What are the only two vertebrae whose surfaces move upon each 

 other? How is motion between the other vertebrae accomplished? 



20. In a long bone what is chiefly a storage tissue, saving food for 

 future use? (117.) 



21. Ligaments are of very slow growth. This accounts for the 

 tedious nature of the recovery from what kind of accidents ? 



22. Observe how many of your classmates sit "slid forward" in 

 the seat, and report in recitation the result of your count. 



23. When the school is marching out, count those who walk with 

 the head protruded. 



24. A bone felon is often caused by a bruise on the bone beneath 

 the periosteum. Why should it be lanced? 



