But they tried their utmost to look upwards; and now a curious struggle,
with spasmodic twitchings, could be observed between the whole
or only the central portion of the frontal muscle, and the several
muscles which serve to lower the eyebrows and close the eyelids.
The involuntary contraction of the pyramidal caused the basal
part of their noses to be transversely and deeply wrinkled.
In one of the three children, the whole eyebrows were momentarily
raised and lowered by the alternate contraction of the whole frontal
muscle and of the muscles surrounding the eyes, so that the whole
breadth of the forehead was alternately wrinkled and smoothed.
In the other two children the forehead became wrinkled in the middle
part alone, rectangular furrows being thus produced; and the eyebrows
were rendered oblique, with their inner extremities puckered and swollen,--
in the one child in a slight degree, in the other in a strongly
marked manner. This difference in the obliquity of the eyebrows
apparently depended on a difference in their general mobility, and in
the strength of the pyramidal muscles. In both these cases the eyebrows
and forehead were acted on under the influence of a strong light,
in precisely the same manner, in every characteristic detail,
as under the influence of grief or anxiety.
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