MUSCLES OF FROG S LEG 



13 



ileo-fibularis, the gastrocnemius, and the sartorius 

 muscles (Fig. 6). 



With small pointed scissors, cut through the connec- 

 tive tissue on either side of the ileo-fibularis, pass one 

 blade of the scissors close under it, cut it through, re- 

 move it, and note the sciatic nerve. Isolate the nerve 

 throughout the thigh by cutting and tearing the tissue 



Cr 



Fig. 6. Muscles (a) of ventral surface, (6) of dorsal surface of right leg 

 of frog. -Sart., sartorius; Cr., cruralis; Gr.m., gracilis major; Gast,, 

 gastrocnemius; Gl.m., glutseus magnus; Il.fib., ileo-fibulaVis; Sm., 

 Semi-membranosus. 



around it. Pinch it several times proceeding from above 

 downwards, at each pinch (mechanical nerve stimu- 

 lation) contraction occurs in the lower leg. Pinch the 

 upper part of the nerve again, there is no contraction 

 of the muscles ; the conductivity of the nerve has been 

 destroyed; hence in dissecting a living nerve it must 

 not be picked up with forceps. 



