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Dr. Cunningham—Surface Anatomy of the Primate Cerebrum. 191
depth of the portion of the cerebrum which lies above the Sylvian fissure ;
(2) the degree of flexuosity of the fissure; and (3) the union or non-union
of the fissure with the inferior transverse furrow of Eberstaller. The
following are my results :—
Length of the Fissure of Eolando.
Number
of
Hemispheres
.
Average
Males.
Females.
Age.
Relative
Length
(Male and
Female).
Number
of
Hemispheres
.
Average
Relative
Length.
Number
of
Hemispheres
.
Average
Relative
Length.
•i-H
5^ to 6^ months, ....
8
16-7
uterine '.
to 1\ months, ....
7^ to 8J months, ....
6
10
25-1
35-4
2
29-7
8
36-8
Intra
Full-time foetuses, . . .
11
32-8
10
33
1
31
(
First 12 months, ....
8
35-8
8
35-8
4 to 5 years,.....
7
33-9
5
33-4
2
38-5
11 to 15 years, ....
6
36-1
4
33-7
2
38-9
1 <
Adult,.......
30
39-3
14
38-6
16
40-1
trau
Chimpanzee,.....
4
61-1
H
m
Orang,.......
4
47-2
Hamadryas,.....
1
41-1
From this Table it is clear that if there is any sexual distinction to be
discovered in the relative length of the fissure of Rolando, it is quite in the
opposite direction from that stated by Passet and Rohon. My own belief
is, that the length of the fissure is considerably affected by the shape of the
head, and that in brachycephalic individuals it is relatively longer than
in dolichocephalic individuals.
The great relative length of the fissure in the anthropoid apes is remarkable
. This is partly explained by the fact, that in the chimpanzee and
orang there is relatively more brain surface above the fissure of Sylvius
than in man (vide p. 144). Further, the anthropoid fissure is more flexuous.
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