. Medical electricity; a practical treatise on the applications of electricity to medicine and surgery. ed, be irritated by pinching, bychemicals, or by galvanism, it will at once contract—i. e.,shorten in its long diameter and bulge at the left undisturbed, the muscle remains entirely quiet;but when irritated, it contracts. It is not necessary thatthe irritation be applied directly to the muscle. Con-traction will ensue in the muscle when the motor nervesupplying it is subjected to irritation. The nerve, also,possesses the property of irritability, but no changetakes place in its f
. Medical electricity; a practical treatise on the applications of electricity to medicine and surgery. ed, be irritated by pinching, bychemicals, or by galvanism, it will at once contract—i. e.,shorten in its long diameter and bulge at the left undisturbed, the muscle remains entirely quiet;but when irritated, it contracts. It is not necessary thatthe irritation be applied directly to the muscle. Con-traction will ensue in the muscle when the motor nervesupplying it is subjected to irritation. The nerve, also,possesses the property of irritability, but no changetakes place in its form or appearance when it is subjectedto irritation. It may undergo some molecular modifica-tion, but the nature of this is unknown. The impulseorioinating in the nerve by irritation is communicated tothe muscle, and contraction of the muscle takes muscle-nerve preparation for demonstrating a muscu-lar contraction consists of the gastrocnemius, with thesciatic attached, of the frog. The nerve is acted on bythe electrodes of an induction machine, and the muscle is 102 J3 A. The moist chamber containing the muscle-nerve preparation. (The muscle-nerveand electrode-holder are shown on a larger scale in Fig. 56.) Them scle m, sup-ported by the clamp el, which firmly grasps the end of the femur f, is connected ACTION OF GALVANISM ON NERVES. 108 by means of the S hook s and a thread with the lever /, placed below the moistchamber. The nerve «, with the portion of the spinal column n still attached toit, is placed on the electrode-holder el, in contact with the wires x y. The wholeof the interior of the glass case gl, is kept saturated with moisture, and the eiec-trode-holder is so constructed that a piece of moistened blotting-paper may beplaced on it without coming in contact with the nerve. B. The revolving cylinder bearing the smoked paper on which the lever writes. C Du Bois-Reymonds key arranged for short-circuiting. The wires x andy of theelectr
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectro, bookyear1887
