Abstract
1) In the sciatic nerve of toads, the greater the diameter of nerve fibers, the more the number of incisures in 1000μ,. The correlation coefficient is+0.44 (significant level 0.1 % ). Its regression line y is 1.87x+17.1.
2) T he greater the diameter of a fiber, the longer the internodal length. The correlation coefficient is 0.75 (significant level 0.1 %). Its regression line y is 185x-165
.3) The greater the diameter of a nerve fiber, the more the number of incisures in a myelin segment. The correlation ratio is 0.975. The curved line E is 8.71×1.17x
4) There is no regularity in th e arrangement of incisures.
5) When fixing solution is added incisures are o p ened, but the number of incisures shows no increase or decrease. The opened incisures do not recover to their former form.
The author heartily thanks the kind criticism of Prof. T. Taniguchi. This work has been done under the project of Instructor M. Ihnuma.
