Sir C. Bell, who erroneously thought that the corrugator was peculiar
to man, ranks it as "the most remarkable muscle of the human face.
It knits the eyebrows with an energetic effort, which unaccountably,
but irresistibly, conveys the idea of mind." Or, as he elsewhere says,
"when the eyebrows are knit, energy of mind is apparent, and there
is the mingling of thought and emotion with the savage and brutal
rage of the mere animal."[1] There is much truth in these remarks,
but hardly the whole truth. Dr. Duchenne has called the corrugator
the muscle of reflection;[2] but this name, without some limitation,
cannot be considered as quite correct.
[1] `Anatomy of Expression,' pp. 137, 139. It is not surprising
that the corrugators should have become much more developed in man
than in the anthropoid apes; for they are brought into incessant
action by him under various circumstances, and will have been
strengthened and modified by the inherited effects of use.
We have seen how important a part they play, together with
the orbiculares, in protecting the eyes from being too much
gorged with blood during violent expiratory movements.
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