A system of medicine, by many writers; . he adjacent parts, and fades aAvay into the normalcord, not usually haAdng a sharp boundary. Under a high poAver of themicroscope it is seen to be made up of fine fibres, of nuclei, and of smalland large neuroglia cells, a fcAv of Avhich are seen, in some cases, to be ina state of vacuolisation and progressive liquefaction, and to be breakingdoAvn. A fine filamentous netAvork, containing spider cells and spindle-shaped cells Avith long processes and many nuclei, extends outAA-ard intothe nerve-tissue—the appearance being that of a partial infiltration o
A system of medicine, by many writers; . he adjacent parts, and fades aAvay into the normalcord, not usually haAdng a sharp boundary. Under a high poAver of themicroscope it is seen to be made up of fine fibres, of nuclei, and of smalland large neuroglia cells, a fcAv of Avhich are seen, in some cases, to be ina state of vacuolisation and progressive liquefaction, and to be breakingdoAvn. A fine filamentous netAvork, containing spider cells and spindle-shaped cells Avith long processes and many nuclei, extends outAA-ard intothe nerve-tissue—the appearance being that of a partial infiltration of thenormal cord Ijy gliomatous elements, the degree of which is greatest nearto the AAall of the cavity. Such an infiltration of the cord with cells isalso found in the segments above and l)clow the limits of the cavity,especially about the central canal. The cavity frequently occupies the placeusually taken by the central canal. Sometimes it is seen to communicateAvith the remains of the central canal, Avhen some epithelial elements. PLATE II.—The appearance of a cord in a rnv.^
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