The laws and mechanics of circulation, with the principle involved in animal movement . ding of vaso-dilator and constrictornerves in the solar plexus, and the intimate relations it sus-tains to the cerebro-spinal axis, has its explanation, then, inthis circumstance; or, in other words, for maintaining a bal-ance in circulation during respiration, digestion and the vari-ous bodily functions, the voluntary movements especially;while the whole relates to evolution of force expended in theorganism. M<jde of Connecting the Double Ganglionic Chain and SolarPlexus with the Central Nervous System
The laws and mechanics of circulation, with the principle involved in animal movement . ding of vaso-dilator and constrictornerves in the solar plexus, and the intimate relations it sus-tains to the cerebro-spinal axis, has its explanation, then, inthis circumstance; or, in other words, for maintaining a bal-ance in circulation during respiration, digestion and the vari-ous bodily functions, the voluntary movements especially;while the whole relates to evolution of force expended in theorganism. M<jde of Connecting the Double Ganglionic Chain and SolarPlexus with the Central Nervous System or Cerebro-spinal following beautiful illustration (Fig. 113) of the fineanatomy in the roots of the spinal nerves furnishes a readyexplanation for the mode of effecting continuity in force be- SPINAL NERVES AND DOESAL GANGLIA. 27& tween the viscera and central nervous system. The sectionincludes the roots (A, B) of the spinal nerves with the gan-glion on the posterior root, carried beyond the point of junction(C) of the connecting links of the dorsal ganglionic chain.,. Fig. 113.—The two Roots of the Spinal Nerves, showing relation of the fibres of thesympathetic (C) to them.—Ley dig. A, posterior root; B, anterior root; C, nervefrom the sympathetic spinal chain at the point of division into the roots of the spinalnerves ; trunk of a spinal nerve at the point of union of the two roots. while the two roots (D) of the spinal nerves come together toform the single nerves of which the so-called intercostals formthe major portion. As will be seen, some of the fibres of intercommunication(c) between the dorsal ganglia and the spinal medulla pass 280 SPINAL NERVES AND DORSAL GANGLIA. up (or jDass down, as the case may be) the anterior or motorroot of the spinal nerves (c, B)} while others pass up the pos-terior or sensory root (c, A), connecting with the nerve cells ofits ganglion, and through these connecting with the spinal me-dulla Thus, we have the roots to the gangl
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