The laws and mechanics of circulation, with the principle involved in animal movement . les by means of respiration and circulation, which are incorrespondence with the activities, so that the force is neces-sarily generated in the muscles themselves; but since thenervous apparatus produces and regulates the muscular move-ments, it follows that the force so generated would have topass into the nerves to the spinal cord, thence out again intothe muscles, the nerves serving to conduct it to and fro be-tween the muscles and the ganglia, under guidance and direc- GENESIS OF NEKVOS FORCE. 505 tion
The laws and mechanics of circulation, with the principle involved in animal movement . les by means of respiration and circulation, which are incorrespondence with the activities, so that the force is neces-sarily generated in the muscles themselves; but since thenervous apparatus produces and regulates the muscular move-ments, it follows that the force so generated would have topass into the nerves to the spinal cord, thence out again intothe muscles, the nerves serving to conduct it to and fro be-tween the muscles and the ganglia, under guidance and direc- GENESIS OF NEKVOS FORCE. 505 tion of the ganglia, which determine the movements. In short,it wonld seem to ns that the electric force generated in the tis-sues passes np one set of nerves, notably the so-called sen-sory nerves, to the posterior columns of the cord (Fig. 214, 13),thence through the gray matter of the cornua, and out againthrough the anterior roots or motor nerves (11, 11,11) fromthe anterior columns to the muscles, the nervous ganglia inthe cord serving to separate and limit the currents, so as to Fig. 214.—Transverse Section of the Spinal Cord at the Origin of the Fifth Pair ofCervical Nerves.—Stilling. In this figure, the white substance of the cord is repre-sented in black, to show more clearly the limits of the gray matter ; 1, 1, antero-lateral columns ; 2, 2, posterior white columns ; 3, anterior median fissure ; 4, pos-terior median fissure ; 5, white commissure ; 6, gray commissure ; 7, central canal ;8, 9, anterior cornua of gray matter ; 10, 10, group of large multipolar cells ; 11,11, 11, anterior roots of the spinal nerves ; 12, posterior cornua of gray matter ; 13,posterior roots of the spinal nerves. specialize, at the same time regulating, the energy of themovements in the muscles, and so as to produce expansionor contraction, as the case may be, in the exigencies in thefunctions ; otherwise impossible. We know, too, that thenervous apparatus regulates respiration and circ
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Keywords: ., bookcentury1800, bookde, booksubjectblood, booksubjectrespiration
