. Practical electricity in medicine and surgery. Fig. 146.—Contraction of the Buccinator. MOTOR POINTS OF FACE. 169 the masseter. Effects: The mouth is drawn to one side and thecheek is pressed against the gums and teeth. (See Fig. 146.) The triangularis menti may be isolated near the angle ofthe jaw, or may be caused to contract jointly with the levatormenti by stimulating the common branch of the facial runningto these muscles before its division. Effects: It draws the angleof the mouth and the outer half of the lower lip downward andoutward, widening but not opening the Fig. H7.—Bil
. Practical electricity in medicine and surgery. Fig. 146.—Contraction of the Buccinator. MOTOR POINTS OF FACE. 169 the masseter. Effects: The mouth is drawn to one side and thecheek is pressed against the gums and teeth. (See Fig. 146.) The triangularis menti may be isolated near the angle ofthe jaw, or may be caused to contract jointly with the levatormenti by stimulating the common branch of the facial runningto these muscles before its division. Effects: It draws the angleof the mouth and the outer half of the lower lip downward andoutward, widening but not opening the Fig. H7.—Bilateral Contraction of the Quadratus Menti. The quadratus menti is best stimulated directly, as it isdifficult to isolate the nerve going to it. Effect: To draw therespective sides of the lower lip downward and outward, press-ing it against the teeth. (See Fig. 147.) The levator menti may sometimes be stimulated by appli-cation of the electrode over the nerve after it branches off fromthe nerve supplying this muscle and the triangularis, but it isusually better to apply the electrode upon the muscle itself justat the inner edge of the quadratus. Bilateral contraction of the 170 PRACTICAL ELECTRICITY IN MEDICINE AND SURGERY. levator menti causes flattening of the chin, and partial ectropiumof the lower lip. The expression produced is that of contemptu-ous haughtiness. (See Figs. 1-48 and 149.) Von Ziemssensays, with ill-concealed sarcasm, that this muscle may be con-sidered the interpreter of exalted self-consciousness in scientists,officials, and aristocrats. He calls it
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectelectri, bookyear1890
