. A manual of diseases of the nervous system. ce of the cord. The extra-dural tumours may spring fromthe membrane or from the tissue between the membrane and thebone, or may grow into the canal from the outside, through theintervertebral foramina. Subdural tumours may proceed from theinner surface of this membrane, from the arachnoid, or from the piamater (Fig. 176). The growths in the cord may spring from the , or may develop in the substance of the cord. They sometimesproceed from the peculiar tissue which surrounds the central canal. The forms of extra-dural tumours are lipoma, fro
. A manual of diseases of the nervous system. ce of the cord. The extra-dural tumours may spring fromthe membrane or from the tissue between the membrane and thebone, or may grow into the canal from the outside, through theintervertebral foramina. Subdural tumours may proceed from theinner surface of this membrane, from the arachnoid, or from the piamater (Fig. 176). The growths in the cord may spring from the , or may develop in the substance of the cord. They sometimesproceed from the peculiar tissue which surrounds the central canal. The forms of extra-dural tumours are lipoma, from an overgrowthof the fat which normally exists between the membranes and the bone;and parasitic tumours, chiefly echinococci; but all are rare.* Gl-rowthsalso occur that spring from the bones or intervertebral tissue—enchon-droma, sarcoma, and cancerous tumours, which have been alreadyconsidered. Far more frequent are collections of inflammatory pro-ducts from bone disease, but these do not come into the category ofmorbid growths. „^..^. Fia. 174.—Myolipoma of the spinal cord. A, transverse section of the tumourand of the conus meduUaris of the spinal cord, to which the growth wasattached, and of which the grey matter is represented by the dotted shadingCM. n, sections of nerve-roots, partly enclosed in the tumour; m, bundles ofmuscular fibres. B, part of the tumour more highly magnified, showing the fat-cells, of which it was chiefly composed; , pia mater of the cord, of is part of the lateral column. C, part of the tumour, still more magnified,showing striated muscular fibres, fibrous tissue, and fat-cells (see also Fig. 167,p. 580). The tumour had caused no symptoms. * An adeuo-sarcoma has also been met with (Hodenpyl, Am. Journ. Med. ). TUMOURS. 609 The tumoiirs wMch hegm -witliin the dura-matral sheath are chieflysyphilomata, sarcomata, and myxomata, sometimes containing cysts or brain-sand. Tubercular and parasitic tumours are rare, but bothe
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