. Human physiology : designed for colleges and the higher classes in schools, and for general reading. expression. 334. Having thus noticed the principal muscular motionsthat are concerned in the expression of the countenance, I pro-pose now to go more extensively into the subject, and showyou how other muscles, besides those to which I have alluded,act in producing certain expressions. I shall also show howthe expressions are varied by combinations of muscular action,for it is as true of the muscles of expression in the face, as itis of the muscles generally, as stated in § 309, that almost e
. Human physiology : designed for colleges and the higher classes in schools, and for general reading. expression. 334. Having thus noticed the principal muscular motionsthat are concerned in the expression of the countenance, I pro-pose now to go more extensively into the subject, and showyou how other muscles, besides those to which I have alluded,act in producing certain expressions. I shall also show howthe expressions are varied by combinations of muscular action,for it is as true of the muscles of expression in the face, as itis of the muscles generally, as stated in § 309, that almost everymovement is produced, not by the action of one muscle alone,but by the action of several, sometimes many muscles. Thevarious expressions of the countenance are all of them com-pound results, some of them more so than others. 228 HUMAN PHYSIOLOGY. Description of the muscles of expression in the face. 335. I will first call your attention to the particular musclesof expression in the face, and indicate their mode of are represented iu Fig. 130. There is a thin flat muscle FIG. MUSCLES OF THE FACE. covering the whole top of the head, represented at 1, 2, and 3 ;3 being its thin tendinous part. It is fastened to the largebones behind, and in front its fibres end in the skin of the fore-head and the eyebrows, and in the circular muscle of the eye-lids, 4. When it contracts, therefore, it raises the skin of theforehead and the eyebrows; and if it contract strongly, itwrinkles the forehead. The circular muscle of the eyelids, 4,when it contracts closes the eye. This and the large frontalmuscle just described, you can see, must have much to do withthe expression of the countenance. There is a very importantthough small muscle which is not seen on this figure. Yousee it on Fig. 113, at a. It is attached to the bone at the sideof the top of the nose, and is inserted into the skin of the eye-brow. It is called the corrugator supercilii, or wrinlder of theeyebrow. Fr
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