Dunn, Innctvation of the Thigh in the Frog. 239 



those given in Table XI, and discussed in connection with 

 the thigh averages. By reference to that table we find an aver- 

 age area for each crural fiber of 152 square micra for the left 

 leg, and 153 square micra for the right leg. 



The total number of fibers for the left leg is 5385. The 

 total area for the designated sections of the crural and sciatic 

 nerves is .827 of a square millimeter. From these figures an 

 average area of 153 square micra may be estimated for each 

 fiber innervating the left leg of frog B. Similar computations 

 for the right leg give an average of 1 5 i square micra for each 

 nerve fiber. Therefore the average area for each nerve fiber 

 of the leg varies only a few square micra from that of each 

 fiber of the crural or the sciatic nerve at a level just proximal 

 to the point of departure of the first thigh branches. 



TABLE XIII. 



Showing for the cutaneous branches to the thigh, the area, the number 

 of fibers, and the average area for each fiber. 



TABLE XIV. 



Showing for the muscular branches to the thigh, the area, the numbers of 

 fibers, and the average area for each fiber. 



