Neural Centers

  • Santiago Ramón y Cajal


We have already given the essential data regarding the components of the neural tissue. Now we must address the particular study of the organs called neural centers.


Gray Matter Dorsal Horn Corticospinal Tract Ventral Horn Ventral Root 
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  1. 1.
    [When we shall study the cerebellar peduncles, it will be clear that it is not possible to exclude completely an indirect lesion of the dentate nucleus, which evidently could induce to error.—] In our experiments of cerebellar decortication in the guinea pig, we have tried to leave intact the cerebellar nuclei; the resultant descending spinal degenerations were very similar to Marchi’s cerebellar hemisections, which appear to prove that such descending fibers originate positively from Purkinje cells.Google Scholar


  1. a.
    Lamination of the spinal cord gray matter became apparent in cytoarchitec-tonic studies [Rexed (1952) J Comp Neurol 96: 415-495].Google Scholar
  2. b.
    Fig. 100.—he, lateral division of the dorsal root; hi, medial division of the dorsal root.Google Scholar
  3. c.
    It is possible that Cajal’s dorsal horn bundle represents the fragmented portion of the fasciculus proprius of the lateral funiculus, and that the interstitial nucleus corresponds to the reticular nucleus of modern nomenclature.Google Scholar
  4. d.
    Fig. 101.—a, medial division of the dorsal root; b, zone of Lissauer; c, substantia gelatinosa; d, commissural bundle; e, lateral division of the dorsal root.Google Scholar
  5. e.
    Both Textura and Histologie read in error vertebrae instead of spinal segments.Google Scholar
  6. f.
    The descending cerebellar pathway is controversial. In the human, it is insignificant if it exists at all. For a fuller discussion see annotationa in Chapter XIX.Google Scholar
  7. g.
    See annotationn in Chapter XIX for discussion on the ipsilateral and/or contralateral termination of the ventral corticospinal tract.Google Scholar
  8. h.
    Apparently, most of these investigators were correct. It is now clear that the fascicle of Gowers is in fact a mixed bundle of mostly ascending fibers which includes the ventral spinocerebellar tract near the surface of the lateral funiculus; the lateral spinothalamic tract located medial to the previous bundle and, in turn, a mixture of second order sensory fibers terminating in reticular nuclei of the brain stem, superior colliculus and the thalamus; and also probably the most medially placed fibers belonging to the fasciculus proprius of the lateral funiculus.Google Scholar
  9. i.
    Apparently, the dorsal horn bundle, intermediate bundle, and system of the intermediate nucleus are subdivisions of the fasciculus proprius of the lateral funiculus.Google Scholar

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© Springer-Verlag Wien 1999

Authors and Affiliations

  • Santiago Ramón y Cajal

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