Lectures on nervous diseases from the standpoint of cerebral and spinal localization, and the later methods employed in the diagnosis and treatment of these affections . nt that the faradaiccurrent i^hould first be employed upon the patient (the poles of the sec-ondary coil being used). The extent of the overlaj) of this coil (in centi-metres) necessary to produce muscular contractions when the nerve- andmuscle-reactions are being separately tested should be recorded. In caseno muscular contractions ensue, the extent of the overlap which produces THE PEINCIPLES OF ELECTRO-DIAGNOSIS. 193 an unb
Lectures on nervous diseases from the standpoint of cerebral and spinal localization, and the later methods employed in the diagnosis and treatment of these affections . nt that the faradaiccurrent i^hould first be employed upon the patient (the poles of the sec-ondary coil being used). The extent of the overlaj) of this coil (in centi-metres) necessary to produce muscular contractions when the nerve- andmuscle-reactions are being separately tested should be recorded. In caseno muscular contractions ensue, the extent of the overlap which produces THE PEINCIPLES OF ELECTRO-DIAGNOSIS. 193 an unbearably jjainfid current should be ascertained and noted. Thismay be compared with tliat necessary to produce contractions upon thehealtiiy side. The next step in the examination consists in changing the rheophoresto the binding-posts of a galvanic battery. We can now ascertain thenumber of cells or milliamperes (which is preferable) required to producethe different varieties of contractions (enumerated in the table designedfor record) of muscles in homologous regions of the right and left nerve which is impaired should be tested first; and the muscles. Fig. 61.—The Authors Diagnostic Key-board as Applied in Actual Use.—The springelectrodes are represented in the cut (for the purpose of illustration) as applied to the facial,ulnar, and musculo-spiral nerves of each side. If he so chooses, the operator can have hiscase-book on a stand at his right, for recording his observations as they are made. supplied by it should be tested afterward. The strength of the currentemployed should be ascertained by throwing a galvanometer into thecircuit (when extreme accuracy is desired); by so doing, a comparisonof the nerve- and muscle-reactions of the two sides can be based uponconditions which are exactly alike. When we have completed the steps indicated by the chnrt preparedfor the assistance of the practitioner (page 191) we are in ])ossession ofcertain facts which may be o
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