. A treatise on nervous and mental diseases, for students and practitioners of medicine. S. the posterior roots and the posterior horn on one side and on theperiphery of the cord on the other, and to this he gives the name ofthe analgesia tract, as he has found it impaired in all cases of analgesiaand healthy in all cases withont analgesia. Immediately adjoiningthe gelatinous head of the posterior horn, as described by Spitzka inthe same paper, there is a column of vertical fibres which he believesto bear the same relation to the gelatinous substance that the ascend-ing roots of the fifth pair
. A treatise on nervous and mental diseases, for students and practitioners of medicine. S. the posterior roots and the posterior horn on one side and on theperiphery of the cord on the other, and to this he gives the name ofthe analgesia tract, as he has found it impaired in all cases of analgesiaand healthy in all cases withont analgesia. Immediately adjoiningthe gelatinous head of the posterior horn, as described by Spitzka inthe same paper, there is a column of vertical fibres which he believesto bear the same relation to the gelatinous substance that the ascend-ing roots of the fifth pair bear to the gelatinous substance of thetuber cinereum of Rolando, and this analogy inclines him to believethat the tract may be possessed of trophic functions, although he canaffirm nothing more positive than that it was healthy in those casesin which there were trophic disturbances, as well as in that other classof cases with cutaneous lesions directly related to the fulminating Fig. 133. INTERIOR HORN GOVi/eRS COL DIRECTCEREBELLARCOL. ANTERIOR PVRAM/DAL FUNDAMENTALCOL. LATERAL ^PYRAMIDALCOL. SPITZKA-LISSAUER COL POSTERIOR OF GOLLCOLUMN OFBURDACHColumns of the spinal cord, according to our present knowledge. pains. By one of those curious coincidences which have been sofrequent in the history of medicine,^ in the same year Lissauer, ofBerlin, in a long and minute description of the posterior horn in itsrelation to locomotor ataxia, also described these two tracts with greatprecision, calling the region in which they lie the rim-zone {Rand-zone), maintaining that it consisted mainly of fine fibres from theposterior roots, most of which passed into the gelatinous substance,while a smaller portion went to the inner part of the posteriorcolumns. (Fig. 133.) According to this author the posterior hornsreceive posterior root fibres of two kinds : first, large ones that pro-ceed directly into the spongy substance, and then take another direc-tion; secondly,
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