THE BODY SKELETON 



83 



Examine the ends of the bones. With what are they 

 covered? Press this surface. Is it elastic? What is the 

 advantage of this? Is the surface smooth? Of what ad- 



Pelvic Bone 

 Synovial Membrane 



Head of Femur 

 Round Ligament 



i : 1 Capsular Ligament 



FIG. 40. A Joint. 



vantage is this? What is the reason for the enlarged ends of 

 the bones? for their irregular surfaces? 



LII. FORMS OF JOINTS. 



Apparatus. The human skeleton. 



Directions. Examine the following joints and describe 

 the range of motion of each: Knee, elbow, vertebral, 

 shoulder, hip, jaw, head and spine, bones of the skull, ribs. 



Name the bones united in each case and classify the joints 

 under the following names : Hinge, ball and socket, gliding, 

 rotary, dovetail, symphysis. 



Which of the above are movable joints? fixed? 



