THE FORE EXTREMITY. 71 



58. — The shoulder blade has two distinct move- 

 ments. We have seen that it is dragged forward 

 b}' the levator humeri muscle. Its most extensive 

 movement is that of its lower end which gives to 

 the whole blade a pendulum movement. Both these 

 movements are effected by this muscle for the most 

 part. 



59. — The arm bone has also two movements. 

 It is dragged backwards and forwards b}^ the levator 

 humeri muscle. Its greatest movement, however, 

 is a pump-handle movement, having its fulcrum or 

 fixed point at the shoulder point. 



60. — It will be seen on reference to Fig. 9, C, 1, 2, 

 that we have two fore limbs in flexion. The figures 

 are alike, but placed at different obliquities. On 

 comparing the two it will be seen that with the same 



FIG. 9. 



amount of flexion the ' action' will be high or low 

 according to the angle formed hy the body with the 

 scapula or the limb's most fixed part. By further com- 



