134 THE PRINCIPLES OF MYODYNAMICS. 



(i.) This fact agrees with the need of having 

 the cervical lever of greater strength the nearer 

 we get to the insertion of the muscles. 



(2.) In this place, it may be remarked that 

 the femoral neck of the female is oftener broken 

 than the femoral neck of the male, and that the 

 femoral neck of the female is not unfrequently 

 broken near the femoral head. 



132. The gluteus medius is favorably located 

 to apply great force to the femoral neck :— 



See Fig. 27 : Fe is the femur, which is a bent 

 lever ; g m is the gluteus medius, whose origin 

 and insertion are o and i ; H is the femoral 

 head ; c c are the femoral condyles ; F is the 

 fulcrum ; P is the power ; and W is the weight. 

 The femoral neck is a lever of the third order 

 under the action of the gluteus medius ; — Pro- 

 long the long axis of the femoral neck — inward, 

 if necessary, till it meets at d a perpendicular 

 drawn from the origin of the contracting muscle 

 — outward, till it meets a perpendicular drawn 

 from the lower end of the femur ; and prolong 

 the long axis of the contracting muscle till it 

 meets at a, the prolonged axis of the femoral 



