. Diseases of the nervous system : for the general practitioner and student. t for ninety minutes, he should ascend at once to 50 feet,then rest for ten minutes. From that time on he should come up 10 feetfour times in succession with intervals of ten, twenty, thirty and thirty-five minutes, after which he leaves the water. SYRINGOMYELIA IV. Syringomyelia Syringomyelia is characterized by a formation of a cavity or cavitiesin the spinal cord. Pathology.—The macroscopical aspect of a syringomyelic cord isoften quite characteristic. It may be flat, soft or fluctuating. Its cervicalportion, the u
. Diseases of the nervous system : for the general practitioner and student. t for ninety minutes, he should ascend at once to 50 feet,then rest for ten minutes. From that time on he should come up 10 feetfour times in succession with intervals of ten, twenty, thirty and thirty-five minutes, after which he leaves the water. SYRINGOMYELIA IV. Syringomyelia Syringomyelia is characterized by a formation of a cavity or cavitiesin the spinal cord. Pathology.—The macroscopical aspect of a syringomyelic cord isoften quite characteristic. It may be flat, soft or fluctuating. Its cervicalportion, the usual seat of the lesion, is unduly enlarged. A transversesection will reveal the presence of a cavity; the latter may be single ormultiple. It is mostly situated in the cervical segment, it may alsooccupy the entire length of the cord. Most frequently it is found in theposterior commissure and posterior cornua. In some cases it extendsso far backwards that it destroys the posterior roots at their entranceinto the cord. The white matter (lateral columns) becomes involved. Fig. 94.—Hydromyelia of the Upper Dorsal Cord. (Striimpell.) when the cavity has destroyed the gray substance. The cavity mayextend into the medulla. A large cavity may open into the central the entire pathological process consists of a primary enlarge-ment of the central canal. The latter constitutes hydromyelia. The contents of syringomyelic cavities is a fluid analogous to thecerebro-spinal fluid. Microscopically a gliomatous formation is noticed,in the midst of which lies the cavity. This tissue consists of glia cells andglia fibers. The cavity is due to a softening and collapse of the center of thegliomatous tissue. The normal nervous elements affected by the latterare naturally destroyed. The tracts of nerve-fibers degenerate accordingto their directions. Cavities may be also the result of inflammatoryprocesses within the cord or of hematomyelia (see this chapter). In suchcases, instea
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectnervous, bookyear1913
