DIAMETERS OF NERVE CELLS AND FIBERS San 
In table 4 are a series of measurements for the large cell bodies 
in the ventrolateral part of the ventral horn of the seventh 
cervical segment of the spinal cord as they appear in transverse 
section (at 2, fig. 1). The arrangement of the data is as given 
in table 3. The increase for the computed diameters is 1.3 for the 
cell bodies and 1.2 for the nuclei. 
When the corresponding data for the longitudinal section of the 
spinal cord (at 3, in fig. 1) are tabulated, they appear as in table 5 
TABLE 4 
Mean diameters in micra of the ten largest spinal cord cells—from the ventrolateral 
area of the ventral horn as they appear in a transverse section. Long diameter, 
short diameter, and ‘computed diameter,’ which is the square root of the product 
of the long and short diameters. Also the mean diameters of the respective nuclet. 
The ratio of the last to the first entry is given at the foot of each column 
CELLS 
NUCLEI 
BODY WEIGHT a PMSA. LL? . oe ba Er) co kee See TD 
Long diameter Short diameter Sa v heteyt 
grams 
18.7 29.4 18.0 2800). 12.8 
25.0 30.8 18.0 23.5 13.0 
43.3 34.6 18.4 25.2 13.4 
59.2 30.4 18.8 25.8 14.4 
81.0 34.0 22.0 27.4 14.8 
115.0 37.6 21.6 28.6 14.8 
120.3 36.0 22.0 28.2 16.0 
149.3 38.4 22.4 29.4 15.2 
178.0 37.0 22.6 28.9 Toye 
Doon 36.6 22.0 28 .4 15.2 
243.1 36.4 22.4 28.6 15.2 
316.3 36.8 24.4 29.9 15.4 
IRATIOBSSsok seo 1:1.3- 1:1.3+ 13148 ele 
and show an increase of 1.2 in the diameter cell body and 1.2 in 
the nuclei. 
The relations represented by the numbers in tables 2 to 5 are. 
shown graphically in charts 1, 2, and 3. 
In this connection it may be well to repeat the statement that 
necessarily two different specimens were used for the cells in the 
spinal cord so that the data in tables 4 and 5 are not only from 
sections made in different planes, but also from a different series 
