GROWTH OF THE FETAL CENTRAL NERVOUS SYSTEM 
Growth of the cerebrum 
423 
The growth of the cerebral hemispheres is portrayed by figures 
3 to 9, inclusive, and figures 37 and 38, and is shown numerically 
in tables 3 to 16, inclusive. 
formula: 
It may be expressed by the empirical 
Volume of the cerebrum (ce.) = (0.12 (C H length cm.))*19 
TABLE 7 
Volume of the right hemisphere 
Formula: Right hemisphere volume (cc.) = (0.1 crown-heel length (cm.))*1 
(115 cases) 
CROWN-HEEL LENGTH | RIGHT HEMISPHERE VOLUME 
Range 
cm. 
Oto 5 
5 to 10 
10 to 15 
15 to 20 
20 to 25 
25 to 30 
30 to 35 
35 to 40 
40 to 45 
45 to 50 
50 to 55 
Mean 
cm. 
12.5 
16:9 
22.6 
27.1 
32.6 
37.2 
42.5 
48 .0 
52.2 
Maxi- Mini- 
mum mum 
cc. cc. 
4.2 1.6 
10.6 2.1 
21.8 9.3 
32.7) 12.4 
eb 218 
109.3 | 48.7 
126.6 | 67.2 
191.5 | 102.9 
185.3 | 148.0 
Mean 
cc. 
CALCULATED 
RIGHT 
HEMISPHERE 
VOLUME 
cc. 
MEANS 
cc. 
DIFFERENCE 
BETWEEN 
OBSERVED AND 
CALCULATED 
NUMBER 
OF CASES 
Calculated volume of the right cerebral hemisphere at 5-cm. intervals of crown-heel 
CROWN-HEEL LENGTH 
VOLUME OF RIGHT 
CEREBRAL HEMISPHERE 
2.6 2.0 —0.6 12 
6.0 5.2 —0.8 14 
14.2 12.8 —0.4 19 
21.8 22st +0.9 12 
39 .2 40.4 ale 17 
65.8 61.1 —4.7 16 
94.6 92.6 —2.0 10 
139.0 135.6 —3.4 a 
166.0 176.4 +10.4 8 
TABLE 8 
length 
ja eens ee RATIO TO NEW-BORN 
cm. per cent per cent 
0.6 
2.6 260.0 2.3 
5.2 144.0 Dds 
8.8 100.0 11.4 
13.5 76.6 20.2 
19.4 62.3 32.7 
25.9 51.2 49.5 
34.4 45.0 71.8 
43.4 39.2 100.0 
53.0 34.7 134.5 
