22 PRACTICAL PHYSIOLOGY 



experiments. Tie a thread round its tendon (tendo 

 Achillis K and cut this away from the calcaneum. 

 Holding it by the thread, tear the muscle upwards 

 away from the tibia, and sever this bone just below 

 the knee. 



Fiu. . V] 



A or Faoc. THZ Lrrat B 

 PATTS GcwexAUEix ET rf AID 



I . . : T -._ : ------- 



Next prepare the sciatic nerve. Separate the 

 muscles at the back of the thigh by the aid of two 

 pairs of forceps, keeping to the inner of the two 

 chief intermuscular septa, and the nerve will be 

 seen, accompanied by the femoral vessels. Do not 

 touch the nerve, but separate the muscles from it 

 as low down and as high up as possible. 



