Central Processes of Sensory Neurons

  • Santiago Ramón y Cajal


As we have stated repeatedly, central processes of spinal ganglion cells run dorsally, and emerge at the dorsal end of the ganglion where they form the posterior roots of the spinal cord. They finally enter the cord at the level of the dorsolateral sulcus, and bifurcate in the white matter of the dorsal funiculus, thus generating ascending and descending branches.


Methylene Blue Gray Matter Substantia Gelatinosa Longitudinal Extent Secondary Degeneration 
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  1. 1.
    Nansen mentions in Myxine the existence of a rare collateral branchlet, although without determining its mode of termination. It is probable that the immense majority of radicular fibers lack collaterals in Myxine, since Retzius could not find them either with the Ehrlich method.Google Scholar
  2. 2.
    To record the sense of apprehension, if nor frank skepticism, elicited by our discovery of bifurcations, we shall transcribe here a paragraph of Lenhossék (1890b): “It is very strange that nobody could ever observe the bifurcations claimed by the Spanish investigator, regardless of the fact that the spinal cord has been the preferred subject of neurologic research since indeed difficult to be convinced that authors have not succeeded in detecting bifurcations of sensory radicular fibers in spite of having explored the cord in every direction and with all sorts of methods, which have perfectly revealed the bifurcations of main stems of spinal ganglion cells”. Times have changed, and today Lenhossék is one of the most fervent supporters of the new doctrine, and it is to his credit to have enriched it with invaluable discoveries.Google Scholar


  1. a.
    Textura and Histologie omit mentioning the equivalents of Fig. 200 in the texts.Google Scholar
  2. b.
    Textura reads in error ventral instead of dorsal.Google Scholar
  3. c.
    See annotation i in Chapter XIX, for participation of the thalamus in sensory pathways.Google Scholar

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© Springer-Verlag Wien 1999

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  • Santiago Ramón y Cajal

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