. A text-book on physiology : for the use of schools and colleges : being an abridgment of the author's larger work on human physiology. of the sympathetic and spinal. the Spinal COld, and consisting of motor and sensory filaments. It makes itsway to the ganglion of the sympathetic, passes over andthrough it, its fibres conjoining themselves with grayones, which they have gathered in the ganglion. Thegray or gelatinous root is to be viewed as having its ori-gin in the ganglion of the sympathetic, and sending itsfibres chiefly to the ganglion on the posterior root ofthe spinal nerve, but few of
. A text-book on physiology : for the use of schools and colleges : being an abridgment of the author's larger work on human physiology. of the sympathetic and spinal. the Spinal COld, and consisting of motor and sensory filaments. It makes itsway to the ganglion of the sympathetic, passes over andthrough it, its fibres conjoining themselves with grayones, which they have gathered in the ganglion. Thegray or gelatinous root is to be viewed as having its ori-gin in the ganglion of the sympathetic, and sending itsfibres chiefly to the ganglion on the posterior root ofthe spinal nerve, but few of them doubtfully communi-cating with the anterior root. The fibres which seem toenter the cord are probably for the supply of blood-ves-sels. Each of these sympathetic ganglia is therefore anervous centre, sending forth strands in three directions:1st. To join the spinal fibres in their distribution; the spinal cord itself, or chiefly to the ganglia on theposterior roots of its nerves; 3d. To the next sympa- How is the sympathetic connected with the spinal system ? Whatnerve supplies originate from the sympathetic ganglia ?. THE GEEAT SYMPATHETIC. 257 thetic ganglion above. In the various plexuses of thesympathetic, vesicles are found, from which gray fibresseem to originate. The branches supplying the visceraconstantly form plexuses; the arteries are surroundedwith such a net-work. The splanchnic ganglia, withtheir interconnecting strands, and supplies from the cere-brospinal, give rise to four great plexuses: the pharyn-geal, the cardiac, the solar, and the hypogastric. Thefirst and last of these are in symmetrical pairs; the oth-er two are single, and placed on the median line. From its construction the sympathetic can not be re-garded as an isolated or self-acting system, since all itsbranches contain fibres derived from the function it must therefore be adjuvant to that system,and it must be admitted that the motor and sensoryqualities of the includ
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