. Practical electricity in medicine and surgery. 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 ment
. Practical electricity in medicine and surgery. 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 the Geheimraths-muskel,—privy-councillors muscle. The masseter and temporal muscles can be made to con-. Fig. US.—Contraction of the Levator Menti (Profile View). tract only by direct muscular stimulation, as the nervous supplyis too deeply situated to be reached from the surface. Themasseter can be stimulated in the sigmoid notch of the lowerjaw; the temporal by one electrode on the anterior and theother on the posterior division of the muscle. Effect: Strongclosure of the mouth and chattering of the teeth. Contraction of the lingual muscles can be produced byunilateral application of an electrode, on either side, above, orbelow. MOTOR POINTS OF FACE. 171 The velum of the palate can be drawn upward so as toclose the posterior nares, by using two electrodes. The uvula can be made to disappear almost entirely bypressing a fine electrode lightly against its base. The azygosmuscle contracts and the entire uvula seems to shrink up,leaving only a small knob-like projection. By pressing an electrode against the internal wall of thepharynx the c
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectelectri, bookyear1890
