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140
Cunningham Memoirs.
fissure to the inferior border of the hemisphere we shall speak of as the
temporal depth.
The entire breadth of the hemisphere, or, in other words, the parietotemporal
depth, was reckoned as being equal to one hundred, and indices
were then calculated which represented the relative parietal depth, the
relative temporal depth, and also the relative position of the Sylvian fissure
with reference to the squamous suture.
XIII. Kelative position of the Sylvian Fissure with reference to the
Squamo-parietal Suture.—We shall examine this aspect of the question in
the first instance. In the adult the position of the fissure with reference
to the suture was determined in seventeen cases, and the following Table
gives the results which ensued :—
Relative position of the Sylvian Fissure with reference to the Squamous
Suture in the Adult.
Temporo-parietal depth = 100.
17 Hemispheres
.
Male.
10 Hemispheres
.
Female.
7 Hemispheres
.
Eight.
8 Hemispheres
.
Left.
9 Hemispheres
.
Fissure immediately sub- \
jacent to the fore-part >
of the suture, . . )
No. of times
noted, . .
2
3
2
3
Fissure at a higher level )
throughout thau the >
ISTo. of times
noted, . .
)>
5
1
4
2
suture, . . . j
Average Index
3-6
3-3
3-6
3-8
2-5
Fissure at a lower level j
than the fore part of >
the suture, . . \
No. of times
noted, .
Average Index
}•
4-1
3
3-3
3
4-1
2
5-7
4
3-2
Six of the heads from which these measurements were taken are figured
in Plates vn. and yili., and they present each of the three conditions. In
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