THE BODY SKELETON 



81 



does it feel? Heat some in water in a tube. What collects 

 on the top of the water? 



B. The Thigh Bone, or Shank, a long 

 bone. Draw the bone, and shade with 

 different colors the parts that are covered 

 with cartilage and with periosteum. What 

 is the function of the enlarged heads of 

 this bone? Of what advantage is it that 

 they are irregular in surface? 



Saw the bone lengthwise, draw, and 

 label the parts. In what portion of the 

 bone is the marrow most plentiful? Is 

 the shaft solid? What is the advantage 

 of this condition? 



C. The Dorsal Vertebra. Draw a dor- 

 sal vertebra from the side and from the 

 top. With the aid of the diagram locate 

 the following parts: The body of the 

 vertebra, spinous process, transverse proc- 

 esses, spinal cavity, rib articulations, 



FIG. 38. Thigh Bone, 

 in Longitudinal Sec- 

 tion. 



FIG. 39. A Dorsal Vertebra: 1, centrum or body; 2, 

 spinous process; 3, spinal cavity; 4, transverse process; 

 5, rib articulation; 6, vertebral articulation. 



vertebral articulations. How are the articulations pro- 

 tected? What is the function of the processes? 



