. A manual of diseases of the nervous system. 636 SPINAL and the tissue around it is moreabundant, but easily distinguish-able from the grey substance,while a little lower down thecavity disappeared and thetissue formed a compact roundedmass. The cavity is lined by adelicate layer of cellular mem-brane; outside this is a fibrousmembrane, lying in folds whichappear as sinuosities in thesection. The existence of thiamembrane shows that the cavityis not simply formed by thebreaking down of the tissue is quite similar instructure to that which is behindthe commissure in b.* The p
. A manual of diseases of the nervous system. 636 SPINAL and the tissue around it is moreabundant, but easily distinguish-able from the grey substance,while a little lower down thecavity disappeared and thetissue formed a compact roundedmass. The cavity is lined by adelicate layer of cellular mem-brane; outside this is a fibrousmembrane, lying in folds whichappear as sinuosities in thesection. The existence of thiamembrane shows that the cavityis not simply formed by thebreaking down of the tissue is quite similar instructure to that which is behindthe commissure in b.* The posterior cornu is notan uncommon seat of cavities,which may extend through thewhole length of the horn. Anexample of this is shown in Haemorrhage had occurredinto the cervical region of thecord (a), which was enlargedand distended with blood, sothat the precise character of thecavity in this region was indis-tinguishable; the blood alsofilled the cavity through the * In connection with the tumour ofthe Cauda equina in these two cases,it may be mentio
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