Bauhaus-Universität Weimar

The theory of decrementless conduction in narcotised region of the nerve
Kato, Genichi
its passage through the asphyxiated region of nerve. It is avoided 
to enter into all the control experiment which were made in 
asphyxia to exclude any possible errors. 
It is a well known fact that KCN deprives the living tissue 
of the power of oxydation. So it may be considered as another 
kind of asphyxiation. Dr. Fukui exposed the different lengths of 
the two nerves taken from the same toad to the action of 2% 
KCN-Ringer solution in the same way as Dr. Maki did with 
narcotics and determined the influence of the lengths of nerve so 
treated on the times required to abolish conduction. And the results 
obtained were that the time so determined has nothing to do with 
the length of nerve treated with KCN. From these results I come 
to the conclusion that the nervous impulse ungergoes no decrement 
in its passage along the “ asphyxiated ” region of nerve. 
B. Some experiments on the problem of 
I have mentioned in Chapter III that the “ limit length ” in 
case of narcosis is about 6 mm., that is, as far as 3 mm. the 
influence from both normal parts above and below can be extended 
into the narcotised region. Dr. Fukui tried to determine the 
“ limit length ” in case of asphyxiation. It was over 8 mm. As 
shown in Table 52, the times required to suspend conduction in 
asphyxiated regions of nerves which are shorter than 9 mm. are 
greater than those required for the longer asphyxiated nerves (group 
A, B, B', C). Under this limit length, the shorter the region 
asphyxiated, the greater the time required. The reason why it is 
so, was explained already in Chapter III. 
It is a matter of some interest that the “ limit length ” is 
different in each kind of means which are employed for the aboli-


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