122 



THE PRINCIPLES OF MYODYNAMICS. 



the inner part of the semi-membranosus the 

 distance was about one-half inch. 



(3.) Hence, other things being equal, the 

 outrotating power of the biceps cruris is five 

 times as great as the in-rotating power of the 

 semi-membranosus. 



(4.) And, as the insertion of the semi-tend- 

 inosus is relatively nearer the center of rotation 

 of the tibia, the semi-membranosus has a greater 

 in-rotating power than the semi-tendinosus. 



b. In the same case the following measure- 

 ments were also made : — 



(i.) The distance from the knee-joint to the 

 insertion of the biceps cruris was about one-half 

 inch. 



(2.) The distance from the knee-joint to the 

 insertion of the semi-tendinosus was about two 

 and one-half inches. 



(3.) Hence, other things being equal, the 

 semi-tendinosus has five times the fiexing 

 power of the biceps cruris. 



.114. In fact, the special rotating antagonist 

 to the biceps cruris is the popliteus : — The 



