1893.] Correlation of Action of Antagonistic Muscles. 



561 



-Z?.c. External cutaneous nerve trunk. 



A.c. Anterior crural nerve trunk, with c, cutaneous, andm', muscular, branches. 



Ob. Obturator nerve-trunk. 



tSc. Sciatic nerve trunk, with I.P., internal popliteal, E.P., external popliteal, 



divisions, and the division going to the hamstring muscles, which gives a 



cutaneous branch c'. 

 Va.Cr. The vasti and the crureus muscles, the internal portion being especially 



referred to. 



I then attempted to determine if mere ' tension of the hamstring 1 

 muscles could give the same result as electrical excitation of the 

 central ends of their nerves. It is, of course, essential that the pro- 

 duction of increased tension in the muscles should not alter the 



