THE BODY SKELETON 



XL VIII. STUDY OF THE SKELETON. 



Apparatus. Human skeleton. 



Directions. Tabulate as follows, the various classes of 

 bones: 



XLIX. GROSS STRUCTURE OF BONES. 



Apparatus. Fresh rib, thigh bone, and dorsal vertebra; saw, 

 needle. 



Directions. A. The Rib, a flat bone. Draw the bone 

 from the flat side. What is found at the ends of the bone? 

 What is the color, consistency, and function of this sub- 

 stance? Bend the bone. Is it flexible? Pick off the mem- 

 brane (periosteum) that covers the bone. Does it separate 

 easily from the bone? Does it tear easily? Are all parts 

 of the bone protected by this covering? 



Saw the rib across. Examine the section and draw it, 

 labelling the parts in the order in which they occur. What 

 part is periosteum? hard bone? spongy bone? marrow? 

 Examine the central marrow. What is its color? How 



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