A treatise on the nervous diseases of children, for physicians and students . dary, and both formsgradually lead to a sclerosisof the nerve-tissues. The symptoms of cerebrallesions are complicated bythose of secondary degenera-tion, which is set up in anyconducting tract in the direc-tion in which the impulsesare transmitted. Thus a dis-ease anywhere in the motortract, if it be of sufficient in-tensity to interfere with thefunctions of the fibres, willcause a descending degenera-tion from the affected regiondownward to the end of themotor tract. Whether the lesion be in the cortex, in the in-t
A treatise on the nervous diseases of children, for physicians and students . dary, and both formsgradually lead to a sclerosisof the nerve-tissues. The symptoms of cerebrallesions are complicated bythose of secondary degenera-tion, which is set up in anyconducting tract in the direc-tion in which the impulsesare transmitted. Thus a dis-ease anywhere in the motortract, if it be of sufficient in-tensity to interfere with thefunctions of the fibres, willcause a descending degenera-tion from the affected regiondownward to the end of themotor tract. Whether the lesion be in the cortex, in the in-ternal capsule, or in the pons, a degeneration starts from thelevel of the lesion and to this degeneration we may attributethe spastic rigidity and the increased reflexes. Secondarychanges always extend as far downward as the point atwhich the gray matter is interposed in the course of the in the case of a lesion in the internal capsule the degen-eration starting from here can be traced through the pyram-idal tracts in the brain and in the lateral columns down to. Fig. 129—Diagram representing Sec-ondary Degeneration of the Pyrami-dal Tracts following upon a Lesion inthe Left Internal Capsule. (Edinger.) 464 THE NERVOUS DISEASES OF CHILDREN. the lowest portion of the spinal cord, but it never passesinto any of the anterior nerve-roots of the brachial orlumbar plexuses, for at this point the gray matter of the an-terior horns is interposed, and the nutrition of the fibresconnected with the gray matter at each level is not affectedby this degeneration of the white fibres at higher lesion, too, in the spinal cord which involves the lateralcolumns, and particularly the pyramidal tracts included inthese, will cause a degeneration from that level see this well illustrated in the cases of cervical andalso dorsal myelitis, in which the symptoms pointing tochanges in the lateral columns are very much the same asthough the lesion had been in the brain, wi
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnervous, bookyear1895
