. A manual of diseases of the nervous system. Fig. 71.—Diagram of the 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 tractia shown by crosses. The anterior ground-fibr
. A manual of diseases of the nervous system. Fig. 71.—Diagram of the 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 tractia shown by crosses. The anterior ground-fibres, lateral limiting layer,and postero-external column are left white. Fig. 66 should be comparedwith this. STEUCTUEB. 209 These degenerations are both ascending and descendiag. Only oneimportant set of fibres degenerates downwards through a considerableextent—those that continue through the cord the anterior pyramidsof the medulla. They commence still higher, in the motor region ofthe cortex of the cerebral hemisphere, passing thence by
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