Freiburger historische Bestände - digital

Dr. Cunningham—Surface Anatomy of the Primate Cerebrum. 179

The following Table gives the relative position of the fissure of Rolando
at different periods of life in the two sexes :—

Topography of the Fissure of Rolando in the Two Sexes.
Mesial Length of the Cerebrum = 100 ; Lateral Length of the Cerebrum = 100.

Males.

Age.

Number of
Hemispheres
Examined.

Fronto-Rolandic Indices.

Upper.

Lower.

7-j to 8£ montlis, .

5

54-5

44-2

Full-time foetuses,

14

53-5

42-6

4 to 5 years,

8

52-3

43-1

Adults, ....

17

52-6

43-7

Females.

7 j to 8£ months, .

12

54-6

42-0

Full-time foetuses,

4

53-7

42-8

4 to 5 years,

6

53-8

43-8

Adults, ....

20

52-9

43-0

The figures in this Table are slightly different from those given in the preceding-
Table, which deals with the general indices. This is due to the fact, that in the
determination of the sexual question a smaller number of hemispheres were examined.

Eberstaller, as we have mentioned, has shown that in the adult, if there
is any sexual difference, it is one in favour of the frontal lobe of the female.
It is curious to note that the above Table shows the same in each period of
growth, but the differences are extremely trifling. This is interesting in
the light of what we shall afterwards note in connexion with the upper end
of the fissure in the anthropoid ape. Eberstaller has pointed out that the
mesial border of the left hemisphere is slightly longer than that of the right

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