THE PRINCIl'LES OF MYODYNAiMICS. 13! 



the long axis of the body are parallel, the down- 

 ward obliquity of the pull of the triceps rotator 

 is about the same as the upward obliquity of the 

 femoral neck : Hence, the downward displacing 

 component of the triceps rotator will be about 

 counteracted by the upward displacing tendency 

 on account of the obliquity of the femoral neck. 



126. When the femur is completely in-ro- 

 tated, the rotating component of the triceps 

 rotator will be small ; but will increase in size 

 during out-rotation of the femur, when the 

 myodynamic angle will be at the maximum. 

 On account of the conformation of the hip-joint, 

 the triceps rotator will always have a large re- 

 tentive and a small displacing component. 



127. The anterior part of the gluteus mini- 

 mus has four components : (i.) A moving 

 component ; (2.) A retentive component ; (3.) 

 A rotating component ; and (4.) A displacing 

 component : — In this case, the retentive com- 

 ponent is always large — on account of the 

 conformation of the hip-joint. 



128. Let us now examine the dynamic rela- 



