Diseases of the nervous system .. . ovided it is sufficiently exten-sive, leads to ascending and descending degeneration. This is most distinctand intense in foci which affect the entire transverse section. Transverse myelitis (Fig. 118) furnishes the clearest types of these degen-erations, and its course will therefore best illustrate other less extensive fociand slighter degenerations. (1) SECONDARY DESCENDING DEGENERATION OF THE SPINAL CORD It is evident that descending degeneration follows in the main the courseof the motor tracts in the spinal cord, since, so far as we know, all the motor
Diseases of the nervous system .. . ovided it is sufficiently exten-sive, leads to ascending and descending degeneration. This is most distinctand intense in foci which affect the entire transverse section. Transverse myelitis (Fig. 118) furnishes the clearest types of these degen-erations, and its course will therefore best illustrate other less extensive fociand slighter degenerations. (1) SECONDARY DESCENDING DEGENERATION OF THE SPINAL CORD It is evident that descending degeneration follows in the main the courseof the motor tracts in the spinal cord, since, so far as we know, all the motortracts in the structure of the spinal cord run in a descending direction, i. e.,caudally. True, we also know of a few sensory centrifugal tracts; it will be remem-bered that all of the fibers which enter the spinal cord (spinal ganglia) from the primary sensory centers divide intotwo branches, a descending branch which,as a rule, is short, and an ascending onewhich is often much longer. There-fore, in myelitic foci those descending.
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Keywords: ., bookcentury1900, bookdecade1900, bookpu, booksubjectnervoussystem
