lOO THE PRI^XIPLES OF MYODYXAMICS. 



time the special flexors of the foot, as they pass 

 around the malleoH, will have strong displacing 

 components. The displacing components of 

 both sets of muscles will act downward and 

 backward ; but the muscles of the tendo-Achillis, 

 during this time, will have a strong displacing 

 component acting upward and forward, and 

 counteracting the displacing components of the 

 special flexors and the extensors of the foot. 



96. From the point of complete extension the 

 foot can be flexed about forty-five degrees. In 

 any position of the foot, the extensors and 

 special flexors have marked displacing compon- 

 ents acting backwards. But when the tendo- 

 Achillis meets the long axis of the foot at right 

 angles, the muscles of this tendon will not have 

 a displacing component ; all the energy of the 

 muscles will be motor and retentive. 



97. The displacing components of the adduct- 

 ors of the foot will tend to displace the rest of 

 the foot from the astragalus ; but the connec- 

 tions of the subastragaloid joint are very strong, 

 and the malleolus internus will be apt to give 

 way, under the application of great force, when 



