A treatise on the principles and practice of medicine . their trophic cell increases,the degeneration is greatest in the most per-ipheral part of the axone. The degenerationusually stops at the end ramifications of theaxone (see page 766 and Plate XX). Degeneration in the Lower Segment.—Dis-ease of the anterior horns or the nerve trunkcauses degeneration of the nerve toward theperiphery and trophic muscle changes. The re-action of degeneration is elicited. (See Neuritis.)The two neurones do not correspond innumber, because one neurone of the uppersegment is connected with several lowerneurones
A treatise on the principles and practice of medicine . their trophic cell increases,the degeneration is greatest in the most per-ipheral part of the axone. The degenerationusually stops at the end ramifications of theaxone (see page 766 and Plate XX). Degeneration in the Lower Segment.—Dis-ease of the anterior horns or the nerve trunkcauses degeneration of the nerve toward theperiphery and trophic muscle changes. The re-action of degeneration is elicited. (See Neuritis.)The two neurones do not correspond innumber, because one neurone of the uppersegment is connected with several lowerneurones, i. e., various cells in the anteriorhorns at different levels are probably excitedby a single pyramidal fiber. For complexmovements, as of the hands, there are moreFig. 64. — Diagram from pyramidal fibers than for simple movements,Gowers, showing relation of ag f th intercostal muscles. The anterior vertebral spines to their bodies . . • i ni p and to the nerve roots. spinal root nerves 30m with fibers irom \ 12 LI ?10 11 1L .IS PLATE XX B.
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