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De. Cunningham—Surface Anatomy of the Primate Cerebrum. 183
although he brings out many important details in connexion with the craniocerebral
topography of the child, he only gives us absolute measurements,
and consequently they have little bearing upon the present research. Fer£,
also, in a Paper already quoted, furnishes us with much valuable information
regarding the topography of the fissure of Rolando. He refuses to
believe the views put forward by Hamy, and states that in all cases the
fissure of Rolando lies behind the coronal suture. He only gives absolute
measurements, and he seems to regard the coronal suture as being more
fixed in its position than the fissure of Rolando. Symington and Poirier*
have also been led to doubt the accuracy of Hamy's statement.
VI. Topography of the Fissure of Rolando in the Apes.—I shall
now give a Table which shows the position of the fissure of Rolando in
the apes, both in relation to the cerebral surface and the cranial wall:—
Topography of the Fissure of Rolando in the Apes.
Mesial Length of the Cerebrum = 100 ; Lateral Length of the Cerebrum = 100.
Number of
Hemispheres
Examined.
Upper Indices.
Lower Indices.
Fronto-
Rolandic.
Corono-
Eolandic.
Fronto-
Rolandic.
Corono-
Rolandic.
Chimpanzee, ....
4
55-9
16-0
39-2
7-5
Orang, ....
4
55-5
20-7
39-2
111
Hainadryas, ....
2
50-0
13-3
42-1
5-2
Macaque, ....
5
50-0
12-9
40-3
11-4
Cercopethecus,
8
48-1
37-9
Baboon, ....
5
47-7
13-6
40-4
10-2
Cebus, ....
7
46-3
- 5-3
43-8
16-3
Alangaby, ....
8
45-4
41-0
The corono-Eolandic distance was not measured in every case, and therefore the
average results which are given in this Table are not based upon so large a number of
measurements as in the case of the fronto-Eolandic indices. The minus mark before
the upper corono-Eolandic index of Cebus indicates in this case the relative distance in
front of the sutural line.
* Topographie Cranio-Encephalique, p. 24. Paris.
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