. Journal of comparative neurology . ecimenwere measured. These measurements were then tabulated in theorder of their size beginning with the largest fibers. The aver-ages of the first ten records were then taken, the percentage rela-tions of the axis computed and the data arranged as in table 9. It will be seen from this table that the average of the tenlargest fibers in the proximal end of each nerve gives us a meas-urement of square micra for no. 224, square micrafor no. 223 and square micra for no. 222. The average TABLE 9Normal rats: Sectional area of fibers; relation of
. Journal of comparative neurology . ecimenwere measured. These measurements were then tabulated in theorder of their size beginning with the largest fibers. The aver-ages of the first ten records were then taken, the percentage rela-tions of the axis computed and the data arranged as in table 9. It will be seen from this table that the average of the tenlargest fibers in the proximal end of each nerve gives us a meas-urement of square micra for no. 224, square micrafor no. 223 and square micra for no. 222. The average TABLE 9Normal rats: Sectional area of fibers; relation of axis to sheath WEIGHT PROXIMAL END DISTAL END Entirefiber Axis Sheath Per centof axis Entirefiber Axis Sheath Per centof axis 224223222 104117182 Average 135 Average sectional area of the proximal and distal ends, square micra. REGENERATION OF PERIPHERAL NERVES 499 :ProxtTtLal. ?if——Lesion Mcmler of fibers Figure 2 500 M. J. GKEENMAN measurements for the ten largest fibers of the distal ends are85 square micra, square micra and 113 square micra re-spectively. We thus observe that the size of fibers diminishesfrom the proximal to the distal ends, this diminution averagingabout 29 per cent of the proximal measurements, in a distanceof 10 mm.—the length of nerve excised. Combining these aver-ages of the proximal and distal ends, we have squaremicra as the average sectional area for the ten largest fibers inthe middle zone of the nerve. We observe also from table 9, that the sectional area of fibersincreases as the weight of the animal increases. Taking weightas an index of age we may infer that in young animals nervefibers increase in sectional area with the age of the animal. SECTIONAL AREAS OF NERVE FIBERS FROM THE CONTROL SIDEOF OPERATED ANIMALS Series 7, including operated anunals nos. 106, 114 and 154,w
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