. A manual of diseases of the nervous system. ding column known as Lissauers tract. ^^^^^ secondary to a lesion in mn r;i £ ±1 , • t^^ dorsal region. (From a The fibres come from the posterior gection prepared by Dr. Mott.) roots ; they course upward for a shortdistance, forming the tract, and then enter the posterior horn. * H. g. by Minkowski, * Deut. Arch. f. kl. Med., Bd. xxxiv, p. 433. Slight degene-ration of the pyramidal tracts was the only other lesion. t In the absence of evidence of contrary character, the direction in which fibresconduct must be assumed to be that in which they dege
. A manual of diseases of the nervous system. ding column known as Lissauers tract. ^^^^^ secondary to a lesion in mn r;i £ ±1 , • t^^ dorsal region. (From a The fibres come from the posterior gection prepared by Dr. Mott.) roots ; they course upward for a shortdistance, forming the tract, and then enter the posterior horn. * H. g. by Minkowski, * Deut. Arch. f. kl. Med., Bd. xxxiv, p. 433. Slight degene-ration of the pyramidal tracts was the only other lesion. t In the absence of evidence of contrary character, the direction in which fibresconduct must be assumed to be that in which they degenerate. We know of noexceptions to it within the central nervous system. Wherever we can observe therelations this law obtains, except in the peripheral sensory nerves, in which the con-ditions are conspicuously exceptional. Hence the probability is very great that thecorrespondence obtains where we have not yet been able to prove it; and to ignorethe probability because it is not a certainty is scarcely reasonable, although 222 SPINAL CORD. Tlie rest of tlie lateral column, in front of tlie pyramidal and cere-bellar tracts, consists of fibres that vary in size, course, and date of de-velopment. Secondary degeneration, however, as I pointed out someyears ago,* enables us to distinguish an important tract which occupiesan irregular area ia front of the pyramidal and cerebellar tracts, anddegenerates upwards throughout the cord. It extends across the lateralcolumn, as a band which fills up the angle between the pyramidal andcerebellar tracts, and it reaches the surface of the cord in front of thelatter tract, nearly on a level with the anterior commissure; it thenextends forward in the periphery of the anterior column, almost to theanterior median fissure, and up to the direct pyramidal tract when thisexists. I have termed it the antero-lateral ascending tract (Figs. 65,71, 75, 76, and 81). It has often been confounded with the directcerebellar tract, and hence
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