He further believes that towards the outer two-thirds of the eyebrow
the corrugator acts in conjunction with the upper orbicular muscle;
both here standing in antagonism to the frontal muscle.
I am unable to understand, judging from Henle's drawings (woodcut, fig.
3), how the corrugator can act in the manner described
by Duchenue. See, also, oil this subject, Prof. Donders' remarks in
the `Archives of Medicine,' 1870, vol. v. p. 34. Mr. J. Wood,
who is so well known for his careful study of the muscles
of the human frame, informs me that he believes the account
which I have given of the action of the corrugator to be correct.
But this is not a point of any importance with respect to
the expression which is caused by the obliquity of the eyebrows,
nor of much importance to the theory of its origin.
`I am greatly indebted to Dr. Duchenne for permission to have
these two photographs (figs. 1 and 2) reproduced by the heliotype
process from his work in folio. Many of the foregoing remarks on
the furrowing of the skin, when the eyebrows are rendered oblique,
are taken from his excellent discussion on this subject.
two eyebrows, as before remarked, are not equally acted on.
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