Nervous and mental diseases . rability of the centralnervous organs in certain individuals. Morbid Anatomy.—The microscopical appearances, as well as thefiner changes, vary greatly with the age of the lesion. The early de-scriptions based on recovered cases were misleading. At the end ofone or two months a focus or several foci of myelitis are found in the 1 Am. Jour. Med. Sciences, 1843. 2 Lyon Medicale. 1888. 3 Hygiene, 1890. 4 Nenrolog. Central blatt, 1890. 5 N. Y. Med. Record, 1894. 6 Australian Med. Gaz., 1897. 7 Jour. A. M. A., Oct, 26, 1907. LESIONS AND DISEASES OF SPINAL GRAY. 379 ante
Nervous and mental diseases . rability of the centralnervous organs in certain individuals. Morbid Anatomy.—The microscopical appearances, as well as thefiner changes, vary greatly with the age of the lesion. The early de-scriptions based on recovered cases were misleading. At the end ofone or two months a focus or several foci of myelitis are found in the 1 Am. Jour. Med. Sciences, 1843. 2 Lyon Medicale. 1888. 3 Hygiene, 1890. 4 Nenrolog. Central blatt, 1890. 5 N. Y. Med. Record, 1894. 6 Australian Med. Gaz., 1897. 7 Jour. A. M. A., Oct, 26, 1907. LESIONS AND DISEASES OF SPINAL GRAY. 379 anterior gray. There is local destruction of nerve-tissue, with dilata-tion and changes in the vessels. The ganglion-cells of the anteriorhorn involved in the lesion have lost their prolongations, show granulardisintegrations, or have entirely disappeared. The myelitic focus occu-pies one or both of the two arterial <^ ^areas of the anterior horn ; namely,that area supplied by the first branchof the anterior median arterv or. I At-
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