. Electro-physiology. Electrophysiology. 60 ELECTRO-PHYSIOLOGY CHAP. the deflection in the former case will be greater. The difference gives the time in which the excitation travels from the distal (central) to the proximal (peripheral) point of exci- tation. At a later period Helmholtz arrived at the same result by a simpler method, the graphic record of the muscle twitches on stimulating two points of the nerve, as widely removed as possible. The difference in the latent period of the two curves, which are FIG. 161.—Rate of transmission of excitation in motor obviously nOll-Coincident,
. Electro-physiology. Electrophysiology. 60 ELECTRO-PHYSIOLOGY CHAP. the deflection in the former case will be greater. The difference gives the time in which the excitation travels from the distal (central) to the proximal (peripheral) point of exci- tation. At a later period Helmholtz arrived at the same result by a simpler method, the graphic record of the muscle twitches on stimulating two points of the nerve, as widely removed as possible. The difference in the latent period of the two curves, which are FIG. 161.—Rate of transmission of excitation in motor obviously nOll-Coincident, nerve of frog (Pouillet's method). (Helmholtz.) n , •• but otherwise congruent {Fig. 162), corresponds to the rapidity with which the excitation is transmitted in the intermediate tract of nerve. In the motor nerves of the frog, at room temperature, this is about 27 m. per sec. Experiments on man by the same method (muscles of ball of thumb) give a much higher result (34 m.). Further observations of Chauveau on the nerves of smooth. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Biedermann, W. (Wilhelm), 1852-1929; Welby, Frances A. (Frances Alice). London : Macmillan
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