http://dl.ub.uni-freiburg.de/diglit/cunningham1892/0140
124 Cunningham Memoirs.
Relative Position of the " Sylvian Point " with reference to the Anterior
End of the Cerebrum at different periods of the growth.
Lateral Length of the Hemisphere =100.
Period of Growth.
Number of
Hemispheres
Examined.
Fronto-Sylvian
Index.
Adults,
53
32-7
11 to 15 years, ....
6
32-1
4 to 5 years, .....
7
34-9
1 year,
8
33-1
Full-time foetuses, ....
11
33-7
1\ to 8^ months, ....
12
35-2
There is apparently no difference in the relative position of the " Sylvian
Point" in the right and left hemispheres of the human brain. Twenty-eight
adult right hemispheres gave a fronto-Sylvian index of 32*7 ; whereas
twenty-five adult left hemispheres afforded an index of 32*8.
In the male, however, the " Sylvian Point" would appear to be placed
slightly in front of the same point in the female, and this is a distinction
which can be made out not only in the adult but also in the earlier stages.
The following are the detailed results :—
Position of the "Sylvian Point" with reference to the Anterior End
of the Cerebrum in the Male and Female.
Lateral Length of Hemisphere = 100.
Period of Growth.
Number of Hemispheres
Examined.
Fronto-Syl
vian Index.
Males.
Females.
Males.
Females.
Adults, .....
31
22
32-4
33-2
11 to 15 years, ....
4
2
31-9
33-1
4 to 5 years, ....
5
2
34-4
36
1 year,.....
2
6
33-3
33-1
Full-time foetuses,
9
2
33-5
34-7
http://dl.ub.uni-freiburg.de/diglit/cunningham1892/0140
