A system of medicine, by many writers; . Fio. 12.—Lower thoracic region. (Prom Brain, Parts 18f»6.) Various hypotheses have been proposed to explain the conditionsdescribed. They may be briefly summarised as follows:—. Fio. 13.—Lumbar enlargement. (Prom 7?miH, Parts 1806.) 1. It has l)ecn that .syringomyelia always originates in acongenital defect in the devclupmeiit of the spinal cord. It has been 6- YRINGOM YE LI A 171 thought that during foetal life and early infancy the central canalof the cord may be unduly distended by fluid, thus remaining as anunusually la
A system of medicine, by many writers; . Fio. 12.—Lower thoracic region. (Prom Brain, Parts 18f»6.) Various hypotheses have been proposed to explain the conditionsdescribed. They may be briefly summarised as follows:—. Fio. 13.—Lumbar enlargement. (Prom 7?miH, Parts 1806.) 1. It has l)ecn that .syringomyelia always originates in acongenital defect in the devclupmeiit of the spinal cord. It has been 6- YRINGOM YE LI A 171 thought that during foetal life and early infancy the central canalof the cord may be unduly distended by fluid, thus remaining as anunusually large cavity Avithin the cord, around which cavity there isa subsequent proliferation of the embryonal epiblastic elements, or athickening of the normal glia tissue, which is known to be more abun-dant in this situation than elsewhere in the cord. Such a cavity is linedwith epithelium, and is recognised by many pathologists under the nameof hydromyelus. But some believe that hydromyelus may pass intosyringomyelia, by the proliferation of glia cells, the invasion of thenormal tissue, and its subsequent breaking down. Thus they explain theadmitted fact that the degree in which the cavity in syringomyelia is linedby cylindr
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