. A text-book of medicine for students and practitioners . occurs at the closure of tlie cathode—that is, when the currentis closed so that the cathode is made the testing pole. On opening the cathode,or on closing or opening the anode, nothing follows. If we increase the strength of the current stil more, the cathodic closure contractions become GENERAL REMARKS UPON DISTURBANCES OF MOTILITY 215 stronger, and the anodic closure and anodic opening contractions appear, nowthe one being earlier and stronger, and now the other. Opening of tlie cathodehas still no effect. Only with a very strong cu
. A text-book of medicine for students and practitioners . occurs at the closure of tlie cathode—that is, when the currentis closed so that the cathode is made the testing pole. On opening the cathode,or on closing or opening the anode, nothing follows. If we increase the strength of the current stil more, the cathodic closure contractions become GENERAL REMARKS UPON DISTURBANCES OF MOTILITY 215 stronger, and the anodic closure and anodic opening contractions appear, nowthe one being earlier and stronger, and now the other. Opening of tlie cathodehas still no effect. Only with a very strong current, in which tlic cathodicclosure contractions have already become tetanic—that is, they still persistafter the closure of the current—can we provoke weak cathodic opening contrac- Deltoid (posterior half). Radial (musculo-spiral)Brachialis anticus, Supinator carpi radialis longior. Extensor carpi radialis brevior. Extensor communis indicis. Extensor ossis metacarpi primi internodii pollieis.,. Dorsal interossei, I and II. —Triceps (long head). y Triceps (external head). Extensor carpi brevis. Extensor minimi indicis. Extensor secundi internodiipollieis. Abductor minimi digiti. — I Dorsal interossei,S III and IV. Fig. 131. tions. Expressed in the abbreviations now in general use in electrical diagno-sis, the law of contraction for normal muscles and nerves in man is as follows: ^ 1. Lowest degree with weak currents: KaSz, KaO—, AnS—, AnO—. 2. Middle degree with stronger currents: KaSZ, KaO—, AnSz, AnOz. 3. Highest degree with very strong currents: KaSTe, KaOz, AnSZ, AnOZ, Ka signifies cathode, An = anode, S = closure, O = opening, z (Zuckung) = weak contrac-tion, Z = stronger contraction, Te = tetanus. Sometimes the increasing .strength of the con-tractions is abbreviated by the signs Z, Z and Z. [Many English and American writers onelectricity use letters derived from th
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