An introduction to physiology . ctorium arranged for break induction STIMULATION OF MUSCLE AND NERVE 121 shocks, placing in the circuit a simple key andthe electro-magnetic signal. Lead wires from thepoles of the secondary coil to the side cups of apole-changer (without cross-wires). In each ofthe remaining two holders of the moist chamberplace a cork pierced by two metal wire in each pair should be insulated fromits fellow by rubbertubing drawn over thepart between the corkand the end of the elec-trode to be appliedto the nerve. Connectthe wire soldered tothe basal ends of thes
An introduction to physiology . ctorium arranged for break induction STIMULATION OF MUSCLE AND NERVE 121 shocks, placing in the circuit a simple key andthe electro-magnetic signal. Lead wires from thepoles of the secondary coil to the side cups of apole-changer (without cross-wires). In each ofthe remaining two holders of the moist chamberplace a cork pierced by two metal wire in each pair should be insulated fromits fellow by rubbertubing drawn over thepart between the corkand the end of the elec-trode to be appliedto the nerve. Connectthe wire soldered tothe basal ends of theseelectrodes with the re-maining cups of thepole-changer in the sec-ondary circuit of theindue torium smoked drum beneath the writing point of themuscle lever. Make a nerve-muscle preparation. Let thenerve rest on the non-polarizable electrodes nearthe cross-section. Place one pair of the metalelectrodes beneath the nerve near the muscle, theother pair near the non-polarizable clockwork of the drum should be fully. Fig. 32. Arrange the signal to write on the 122 GENERAL PEOPERTIES OF LIVING TISSUES wound (not over wound), and the drum shouldrevolve at its most rapid speed. Write twomuscle curves. For the first stimulate throughthe metal electrodes nearer the muscle; for thesecond through the metal electrodes farther fromthe muscle. While each curve is writing, let a tuning forkrecord its vibrations beneath the point of thethe muscle lever. To mark on the abscissa ofthe muscle curve the exact moment at which themuscle was stimulated, turn back the drum untilthe writing point of the signal lies precisely inthe line described by it when the current wasbroken. Now stimulate the muscle with anotherinduction shock. The curved ordinate of themuscle lever will be synchronous with the ordi-nate of the signal. The interval between the moment of stimula-tion, as recorded by the signal, and the beginningof contraction, is greater when the nerve is stim-ulated far from the mus
Size: 1516px × 1649px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectphysiology, bookyear1
