File:General physiology of muscles and nerves (1881) (14754692736).jpg

Identifier: generalphysiolo00rose (find matches)
Title: General physiology of muscles and nerves
Year: 1881 (1880s)
Authors: Rosenthal, I. (Isidor), 1836-1915
Subjects: Physiology Muscles Nerves
Publisher: New York, D. Appleton and company
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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toward the edffe of the cross-section. If thetension prevailing at each point in one side of a longi-tudinal section is represented by the height of a straightline drawn at right angles to that side of the longitu-dinal section, then the curve which unites the heads ofthese Hues is level at the centre of the longitudinalsection, but sinks rapidly down toward the edges of thecross-section. A somewhat sunilar fact is observable on THE MUSCLE-RHOMBUS. 193 the cross-sections, where the tension-curves, correspond-ing with equal differences of tension, are nearer to-gether toward the edge of the longitudinal sectionthan in the middle. If the feet of the diverting arch■are equidistant, the currents, both from the longitu-dinal section and from the cross-sections, are thereforestronger the nearer is the point under examination tothe limit between the longitudinal and cross-sections.Fig. 51 shows this circumstance: A in the figure re-presents the tensions on one of the longitudinal sections
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JiG. 51. Tension ox the longitudinal and ckoss sections of a JILSCLE-PKISM. and on one of the cross-sections of the transverse sectionrepresented in fig. 50; while at B the tension-curves ina cross-section itself are represented. The latter, if themuscle-prism is perfectly round, are concentric circles.In order to judge of the direction and strength of thecurrent resulting when a conducting arch is applied toany two points of a muscle-prism, it is only necessaryto determine the difference of tensions at the feet ofthe arch, and, in so doing, to notice that when positivetension prevails at one of these points, negative tensionat the other, the current tbrouofh the arch is always in 194 PHYSIOLOGY OF MUSCLES AND NERVES. the direction from the positive to the negative point;but that, if the feet are both positive, or both negative,the current passes from the more to the less positivepoint, or from the less to the more negative point.From the curves in A and B, fig. 51, which show the.ten

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