. A manual of diseases of the nervous system. d and include the nerves(Fig. 179), the amount of damage to which is very variable. Multiple tumours outside the cord are sometimes very are usually sarcomata, and spring from the membranes andsheaths of the nerve-roots. They are various in size, ranging fromthat of a hazel-nut to that of a pins head, and many very small growthsare often scattered among the nerves of the cauda equina. In somecases of this character similar growths have existed in the cerebralmembranes. The tumours within the spinal cord are usually small, seldom ex-ce
. A manual of diseases of the nervous system. d and include the nerves(Fig. 179), the amount of damage to which is very variable. Multiple tumours outside the cord are sometimes very are usually sarcomata, and spring from the membranes andsheaths of the nerve-roots. They are various in size, ranging fromthat of a hazel-nut to that of a pins head, and many very small growthsare often scattered among the nerves of the cauda equina. In somecases of this character similar growths have existed in the cerebralmembranes. The tumours within the spinal cord are usually small, seldom ex-ceeding half an inch in diameter, and usually less, even when theygive rise to considerable impairment of function. But their verticalextent often exceeds their transverse diameter, and sometimes theygrow through a considerable extent of the spinal cord. Gliomata, andespecially the gliomatous growths that spring from the central region,and arise from embryonal neuroglial tissue (persistent by arrest of Fio. 176. 176. 611 Pig.
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