Human physiology : designed for colleges and the higher classes in schools and for general reading . is very great, it is ordinarily produced by the actionof very few muscles. The principal muscles are these—themuscle that wrinkles the eyebrow, causing frowning; themuscles which draw down the corners of the mouth; andthose which draw them up. When a smile occurs, it is pro-duced by the muscles which raise the corners of the sadness is expressed, it is done by the muscles by whichthe corners of the mouth are drawn down. Hence the origiuof the common expression, down in the mouth. In
Human physiology : designed for colleges and the higher classes in schools and for general reading . is very great, it is ordinarily produced by the actionof very few muscles. The principal muscles are these—themuscle that wrinkles the eyebrow, causing frowning; themuscles which draw down the corners of the mouth; andthose which draw them up. When a smile occurs, it is pro-duced by the muscles which raise the corners of the sadness is expressed, it is done by the muscles by whichthe corners of the mouth are drawn down. Hence the origiuof the common expression, down in the mouth. In laughter,the muscles which raise the corners of the mouth act strongly,wrinkling the cheek, simply because the corner of the mouth iscarried up so far as to push up the cheek before it. One othermuscle is brought into some action—the circular muscle whichcloses the eyelids—for the eyelids are brought nearer togetherin laughter, though in mere smiling they are not. In , representing broad laughter, you see the two effectsspoken of above, the wrinkling of the upper part of the cheek,. THE LANGUAGE OF THE MUSCLES. 225 Muscles used in the expression of grief. and the partial closure of the eyelids. In weeping, themuscles that draw down the corners of the mouth, which inthe mere expression of sadness act slightly, now act the same time the frowning muscle wrinkles the ordinary weeping it does so but slightly, but in weepingfrom pain this muscle is strongly contracted. So it is alsowhen there is crossness mingled with the grief. Fig. 127, FIG. 127.
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