--Two points alone in the above
description require further elucidation, and these are
very curious ones; namely, the raising of the inner ends of
the eyebrows, and the drawing down of the corners of the mouth.
With respect to the eyebrows, they may occasionally be seen
to assume an oblique position in persons suffering from deep
dejection or anxiety; for instance, I have observed this
movement in a mother whilst speaking about her sick son;
and it is sometimes excited by quite trifling or momentary
causes of real or pretended distress. The eyebrows assume
this position owing to the contraction of certain muscles
(namely, the orbiculars, corrugators, and pyramidals of the nose,
which together tend to lower and contract the eyebrows)
being partially checked by the more powerful action of the central
fascim of the frontal muscle. These latter fasciae by their
contraction raise the inner ends alone of the eyebrows;
and as the corrugators at the same time draw the eyebrows together,
their inner ends become puckered into a fold or lump.
This fold is a highly characteristic point in the appearance
of the eyebrows when rendered oblique, as may be seen in figs.
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