. The physiology of the domestic animals; a text-book for veterinary and medical students and practitioners. Physiology, Comparative; Domestic animals. Fio. 279.—Diagrammatic Curves illustrating the Measurement op the Velocity ok a Nervous Impulse. {Foster.) (To be read from left to right. 1 The same nerve-muscle preparation is stimulated (1^ as far as possible from the mascle, (2) as nearaB possible to the muscle, both contractions being registered in the same manner on the pendulum myograph In (I) the stimulus enters the nerve at the time indicated by the line, a; the contraction, shown by t
. The physiology of the domestic animals; a text-book for veterinary and medical students and practitioners. Physiology, Comparative; Domestic animals. Fio. 279.—Diagrammatic Curves illustrating the Measurement op the Velocity ok a Nervous Impulse. {Foster.) (To be read from left to right. 1 The same nerve-muscle preparation is stimulated (1^ as far as possible from the mascle, (2) as nearaB possible to the muscle, both contractions being registered in the same manner on the pendulum myograph In (I) the stimulus enters the nerve at the time indicated by the line, a; the contraction, shown by the dotted line, begins at 6/; the whole latent period is, therefore, indicated by the distance from a to ft'. In (2) the stimulus also enters the nerve at a, the contraction begins at ft, and is shown in the un- broken line; the latent period, therefore, is indicated by the distance from it. to ft. The time taken up in the passage of the nerve impulse in the length of nerve between 1 and 2 is indicated by the distance be- tween 6 and ft', and may be measured by the tuning-fork curve below. The distance between these curves is exaggerated for the sake of simplicity, no value being given for the rate of vibration of the tuning-fork. mum contraction is reached relaxation commences, following the same general course as in shortening, relaxing first slowly then more rapidly, and then more slowly again, the general duration of the active relaxation being somewhat longer than that of contraction. Such are the general characteristics of the curve of a single muscular contraction produced by a single stimulus. If a single stimulus be allowed to follow the first it will be followed,. Fig. 280.—Tracing of a Double Muscle Curve. (Foster.) (To be read from left to right.) While the muscle was engaged in the first contraction (whoso complete course, had nothing intervened, is indicated by the lower line in the muscle-curve) a second induction shook was thrown in at such a time that the s
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectphysiol, bookyear1890
