Diseases of the nervous system .. . hat the degeneration at the beginning often shows only an intramedullarycharacter ^Nageotte explains by the assumption that the short root fibers (col-laterals?) degenerate first at their distal ends, the process then extendingcellulipetally (apparently a retrogressive change). Strange to say, the motor roots are not exempt; but their injury is lesssevere, is usually higher than the focus in the posterior roots, and the degen-erated fibers show a distinct tendency to regeneration. (This may possiblyaccount for the absence of motor symptoms.) The nerf radicul
Diseases of the nervous system .. . hat the degeneration at the beginning often shows only an intramedullarycharacter ^Nageotte explains by the assumption that the short root fibers (col-laterals?) degenerate first at their distal ends, the process then extendingcellulipetally (apparently a retrogressive change). Strange to say, the motor roots are not exempt; but their injury is lesssevere, is usually higher than the focus in the posterior roots, and the degen-erated fibers show a distinct tendency to regeneration. (This may possiblyaccount for the absence of motor symptoms.) The nerf radiculaire is a channel for the lymph circulation in the cen-tral nervous system, and lesions or irritation in the cerebrospinal fluid may 1 Pathogenie du Tabes dorsalis, 1903. PATHOLOGIC ANATOMY 503 perJiaps at this point have a more concentrated effect. In syphilitic menin-gitis a syphilitic interstitial root neuritis here establishes itself; this is notnecessarily present in all j I ., Spinal cord Anterior root Neuritis radanterior] 3. --Arachnoid L Posterior root — Dura mater erf radiculaire Neuritis Ganglion Fig. 173.— Diagram of the Course of the SpinalRoots and of the Nerf Radiculaire Nageotte. cases of syphilitic menin-gitis, but it is constant intabes. Nageotte found itin 11 cases which he care-fully investigated. It may be present inmany roots, sometimes inthe lumbo-sacral, at othertimes in the dorso-cervicalroots; or some of the rootsmay at various heights beseparated by normal ones,sometimes limited to a few,to one, or to two pairs ofroots—therefore in very ir-regular distribution. In the main the fore-going embodies the findingsand the views of is evident that all sortsof objections may be raisedto this theor}^, but it seemssatisfactorily to explainthe anatomical as well as the clinical picture of tabes—certainly its spinallesions. But we have as yet no proof that these findings are invariable; hence wecannot at present decide in fav
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