Freiburger historische Bestände - digital

Dr. Cunningham—Surface Anatomy of the Primate Cerebrum. 119

Kelation of the Insula to the Coronal Line.
Long axis of the Insula = 100.

Period of Growth.

Number of
Hemispheres
Examined.

Part of Insula

in front of
Coronal Line.

Part of Insula

behind the
Coronal Line.

4 to 5 months, . . .

3

48-3

51-7

5 to 6 mouths,

7

39-7

60-3

6£ months, ....

2

37-2

62-8

7 to 8 months,

2

34-6

65-4

8 to 9 months,

2

32'9

67-1

Adults, ....

4

13

87

The steady increase of the portion of the insula which lies behind the
coronal line and the corresponding relative decrease of the part which lies

Fig. 28.—Lateral view of the skull of a child about nine months old. The internal sutural lines are
brought out on the surface by a series of perforations made from the interior. They can
therefore be compared with the external sutural lines

in front of this line is of course chiefly due to the manner in which the
Sylvian area extends by backward growth. But this does not account for