And
so if the true original is not in the hand, be-there is still
something higher up, neither is the true original in the wrist, for
once more if the elbow is at rest the whole part below it can be moved
as a continuous whole.
9
Now since the left and the right sides are symmetrical, and these
opposites are moved simultaneously, it cannot be that the left is
moved by the right remaining stationary, nor vice versa; the
original must always be in what lies above both. Therefore, the
original seat of the moving soul must be in that which lies in the
middle, for of both extremes the middle is the limiting point; and
this is similarly related to the movements from above [and below,]
those that is from the head, and to the bones which spring from the
spinal column, in creatures that have a spinal column.
And this is a reasonable arrangement. For the sensorium is in our
opinion in the centre too; and so, if the region of the original of
movement is altered in structure through sense-perception and thus
changes, it carries with it the parts that depend upon it and they too
are extended or contracted, and in this way the movement of the
creature necessarily follows.
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