File:A manual of diseases of the nervous system (1892) (14760529736).jpg

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Identifier: manualofdiseases00gowe (find matches)
Title: A manual of diseases of the nervous system
Year: 1892 (1890s)
Authors: Gowers, W. R. (William Richard), 1845-1915
Subjects: Nervous System Diseases Nervous system
Publisher: Philadelphia : Blakiston
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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e to the division of the latter (Sherrington) ; but such divisionhas not been actually demonstrated, and is probably not frequent.The variation in size is from 1 to 25 /u (gwoo ^o xttTo iiich). Thevariations are especially great in the fibres of the pyramidal tract, * So that in some descriptions the posterior horn is divided into (1) spongy sub-stance of the horn itself; (2) geatinous zone of the caput, and (3) spongy zoneat the tip of the horn. See Lissauer, Arch. f. Psych./ 1886. ■j; See Oberoteiuer, loc. cit., p. 192. STRUCTUEE. 171 and it Is in these that division has been thought to occur. Those ofthe direct cerebellar tract are uniformlv large, while most of thosethat constitute the postero-median column are small. It will facilitate the detailed study of the tracts if we considerfirst those that undergo secondary degeneration for a considerabledistance, as our knowledge regarding these is the most complete.These degenerations are both ascending and descending. Only one D.3.
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Fig. 70.—Diagram of tlie elements of the white substance at various levelsof the spinal cord. (Modified from Flechsig.) The pyramidal tracts areshaded by short horizontal lines; the direct cerebellar tract by dots; theposterior median column by dots, as it degenerates in disease of the lowestpart of the cord or of the nerves of the cauda equina; the small circlesin the forepart of this column indicate the area which degenerates indisease of the cervical enlargement. The antero-lateral ascending tractis shown by crosses. It is not repi-esented in the first cervical sectionbecause there are no facts, at present, to show its exact position here;it probably lies chiefly in front of, and between, the direct cerebellar andpyramidal tracts, as 0. 3. The anterior ground-fibres, latenil limitinglayer, and postero-external column are left white. Pig. 62 should becompared with this. 172 SPINAL CORD. important set of fibres degenerates downwards through a consideraLleextent—those that continu

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1
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  • bookid:manualofdiseases00gowe
  • bookyear:1892
  • bookdecade:1890
  • bookcentury:1800
  • bookauthor:Gowers__W__R___William_Richard___1845_1915
  • booksubject:Nervous_System_Diseases
  • booksubject:Nervous_system
  • bookpublisher:Philadelphia___Blakiston
  • bookcontributor:Francis_A__Countway_Library_of_Medicine
  • booksponsor:Open_Knowledge_Commons_and_Harvard_Medical_School
  • bookleafnumber:192
  • bookcollection:medicalheritagelibrary
  • bookcollection:francisacountwaylibrary
  • bookcollection:americana
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30 July 2014

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