Archives of neurology and psychopathology. . andhere again the changes were bilateral, although here thelesion was confined decidedly to one sympathetic cord,namely, the right, the left one being absolutely no interfunicular branches connecting the two sym-pathetic cords are present in their thoracic portions, thebilaterality of the changes must be explained by a crossingof fibres in the posterior commissure, or directly fromone column of Clarke to the other. In view of the fact that the cellular changes in Clarkescolumn were rather equally distributed over the (sixth ?not examined w
Archives of neurology and psychopathology. . andhere again the changes were bilateral, although here thelesion was confined decidedly to one sympathetic cord,namely, the right, the left one being absolutely no interfunicular branches connecting the two sym-pathetic cords are present in their thoracic portions, thebilaterality of the changes must be explained by a crossingof fibres in the posterior commissure, or directly fromone column of Clarke to the other. In view of the fact that the cellular changes in Clarkescolumn were rather equally distributed over the (sixth ?not examined with the Nissl stain), seventh, (eighth ? notexamined with the Nissl stain), ninth and tenth dorsalsegments, it is fair to conclude tbat on the whole the sym-pathetic fibres from the (sixth), seventh, eighth and ninth 136 EXPERIMENTAL RESEARCHES ON THE SYMPATHETIC. sympathetic ganglia—i. e., those extirpated in our animal—take a rather horizontal course in the spinal cord (see Text-Figure 6). Some of these fibres make a slight descent in. TEXT-FIGURE 6.—Diagram showing the afferent fibres derived from thestellate ganglion and lower thoracic sympathetic chain in their course to thespinal cord. The course is suggested by the degenerations following removalof the stellate ganglion and also the lower thoracic sympathetic chain. Theefferent fibres very likely have a similar course in opposite direction. post. //.—Posterior horn. ant. H.—Anterior horn. r. ventr.—Ramus ventralis (anterior division) of dorsal dors.—Ramus dorsalis (posterior division) of dorsal R.—Anterior root.;-. comm.—Ramus communicans. EXTIRPATION OF THE THORACIC SYMPATHETIC. I 3 7 the spinal cord, since marked changes were found in thecells of Clarkes column of the tenth segment, althoughthe extirpation of the thoracic sympathetic nerve extendeddownwards only to the ninth intercostal space, leaving thecommunicant ramus of the tenth dorsal nerve conclusion require
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