Electro-diagnosis and electro-therapeutics : a guide for practitioners and students . transverse segments. (h) On the other hand,Several different muscles are often repre-sented by cells on the same level. The accompanying schematic figure (Fig. 27) will explain the con-clusions resulting from these facts. Let us take as an example thenerve X We see from the schematic drawing that this nerve re-ceives its filaments from three levels: Levels I., II., and III. Level sends filaments to a muscle A, which receives filaments from CHANGES IN TKE BE ACTION 133 nowhere else, and, secondly, a fi
Electro-diagnosis and electro-therapeutics : a guide for practitioners and students . transverse segments. (h) On the other hand,Several different muscles are often repre-sented by cells on the same level. The accompanying schematic figure (Fig. 27) will explain the con-clusions resulting from these facts. Let us take as an example thenerve X We see from the schematic drawing that this nerve re-ceives its filaments from three levels: Levels I., II., and III. Level sends filaments to a muscle A, which receives filaments from CHANGES IN TKE BE ACTION 133 nowhere else, and, secondly, a filament to a muscle B, which receivesthe greater number of its filaments from Levels II. and III. Level besides a filament to the muscle C, which also receives a fila-ment from Level III. Now let us assume that a central disease de-stroys Level I. on one side; then the muscle A must degenerate com-pletely, since all the cells and fibers supplying it will muscle B will likewise be injured, but so little that, as the mass To Muscle A. To Muscle B. To Muscle C,. Level I. Level II. Level III. Fig. 27.—Diagiam of Spinal Cord Localization. of its filaments is received from elsewhere, either no real loss offibers could be proved functionally or electrically or the changeswould be only of a slight nature. The muscle G would remain en-tirely intact. If in such cases we should stimulate electrically thetrunk of the nerve X, we would, indeed, get muscle contraction inthe region supplied by it from both kinds of currents; but not allthe muscles Avould contract, only muscles B and C, while with themuscle ^4 no contraction would occur. If we now stimulate theseparate muscles directly, we should find muscle A faradically in-excitable and showing galvano-muscular D. R. In muscle B weshould find either an entirely normal condition or slight quantitativediminution of excitability or diminished faradic excitability withgalvano-muscular D. R. (partial D. R.). The muscle C
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