THE PRINCIPLES OF MYODYNAMICS. 99 



(c.) The add^idors of the foot are the tibialis 

 anticus, the tibiahs posticus, the flexor longus 

 polHcis, the flexor longus digitorum, and the 

 muscles of the tendo-Achillis. 



(d.) The abductors of the foot are the extensor 

 communis digitorum, the peroneus tertius, the 

 peroneus brevis, and the peroneus longus. 



94. It must be kept in mind that the gastroc- 

 nemius spans both the knee-joint and the 

 ankle-joint, arising from the condyles of the 

 femur and inserted into the os calcis. The im- 

 portant practical relation here consists in the 

 fact that the gastrocnemius can not be com- 

 pletely relaxed without flexing the leg on the 

 thigh and the foot on the leg. This fact will 

 appear to advantage in the reduction of disloca- 

 tions of the foot, and in the setting of broken 

 bones of the leg. 



95. When the foot is completely extended, 

 the tendons of the extensors are held down by 

 the annular ligament, and the direction of trac- 

 tion is downward and backward, so that the 

 extensors, under the circumstances, will have 

 strong displacing components, and at the same 



