File:A system of medicine, by many writers; (1900) (14779781371).jpg

Identifier: systemofmedicine07allb (find matches)
Title: A system of medicine, by many writers;
Year: 1900 (1900s)
Authors: Allbutt, T. Clifford (Thomas Clifford), 1836-1925, ed
Subjects: Medicine
Publisher: New York, Macmillan and co. London, Macmillan & co., ltd.
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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f neurons wasaffected primarily, and the neurons of association later ; whilst in thelatter the two were affected simultaneously. The symptoms entirelydepend upon the anatomical distribution of the degenerative process.The thickening of the i)ia arachnoid, the hyaline thickening of the vesselwalls, and the overgrowth of glia tissue met with in both diseases, TAFES DORS A US may be explained l)y the irritation of the products of degeneration,inducing formative proliferation of the neuroglia elements, which receivean increased supply of nutriment, as the blood-supply can no longer beutilised by the dying nervous elements. It must be remembered, more-over, that the nerve-cell is a perpetual element—it is incapable ofregeneration ; unlike the cell of a gland, its restoration is impossible.Consequently, a poison like syphilis may lower the vitality and diminishthe durability of certain systems of neurons, and given stress, injury, cold, ■issociaiion System ProjectionSystem Carp. Striat
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ClarkesCol,nth afferentCerebeltartract Neuron of,•Ant,Horn Motar^EndPlate Fig. 1.—Diagram illustrating the afferent, efferent, and association systems of neurons. It will beobserved that there are three nervous circles. In voluntary movements impulses are travellingalong all these systems. In tabes there is degeneration and interruption of the afferent path inspinal, cerebellar, and cerebral systems ; consequently incoordination of voluntary movements.Diagrammatically the posterior spinal ganglion is represented as giving off three processes ; moreprobably it only gives otf one. or sexual excesses as immediate factors, the balance of repair and waste isoverturned, and the neurons die gradually and prematurely. In ergotismand fdlarjra very similar systemic degenerations have been described(vol. ii. pp. 793 and 800); but, as neither experimental anaemia nor evenstarvation produces any appreciable wasting of the nervous system, it isprobable that systemic degenerations are due to a psystemofmedicine07allb

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