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[ In the foregoing remarks on the manner in which the eyebrows are made oblique, I have followed what seems to be the universal opinion of all the anatomists, whose works I have consulted on the action of the above-named muscles, or with whom I have conversed. Hence throughout this work I shall take a similar view of the action of the corrugator supercilii, orbicularis, pyramidalis nasi, and frontalis muscles. Dr. Duchenne, however, believes, and every conclusion at which he arrives deserves serious consideration, that it is the corrugator, called by him the sourcilier, which raises the inner corner of the eyebrows and is antagonistic to the upper and inner part of the orbicular muscle, as well as to the pyramidalis nasi (see Mécanisme de la Phys. Humaine, 1862, folio, art. v., text and figures 19 to 29: octavo edit. 1862, p. 43 text). He admits, however, that the corrugator draws together the eyebrows, causing vertical furrows above the base of the nose, or a frown. 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 Duchenne. See, also, on 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.]
704 ([return])
[ 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.]
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[ Mécanisme de la Phys. Humaine, Album, p. 15.]
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[ Henle, Handbuch der Anat. des Menschen, 1858, B. i. s. 148, figs. 68 and 69.]
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[ See the account of the action of this muscle by Dr. Duchenne, ‘Mécanisme de la Physionomie Humaine, Album (1862), viii. p. 34.]