. The Journal of nervous and mental disease . dorsal, signs of sensation couldstill be evoked from the parts below the section. Herzen2 and * Read at the meeting of the American Neurological Association,June 5, 6 and 7, 1902. 82 MORTON PRINCE others confirmed this view that these columns were especiallyfor tactile sense. Osawa,3 on the contrary, in similar experi-ments found sensation entirely abolished. Indeed severence ofthe posterior columns has been performed by different ex-perimenters many times4 at different levels without perceptible im-pairment of sensation. Borchert5 gives a careful
. The Journal of nervous and mental disease . dorsal, signs of sensation couldstill be evoked from the parts below the section. Herzen2 and * Read at the meeting of the American Neurological Association,June 5, 6 and 7, 1902. 82 MORTON PRINCE others confirmed this view that these columns were especiallyfor tactile sense. Osawa,3 on the contrary, in similar experi-ments found sensation entirely abolished. Indeed severence ofthe posterior columns has been performed by different ex-perimenters many times4 at different levels without perceptible im-pairment of sensation. Borchert5 gives a careful resume of theresults of posterior and lateral tract section in 11 dogs and 2 no case where the posterior columns alone were cut was disturbance of tactile perception. The impression is growing from recent experiments6 that theposterior columns are largely for the conduction of muscular ratherthan tactile sense, and there is much in favor of the view adoptedby Hering,7 that they serve to conduct centripetal impulses rom Meyer s article. arising in the apparatus of movement, regulate by unconscious re-actions the movements of the skeletal musculature. Yet Meyerscase seems to show that they are capable of conducting tactilesensation. The lack of pathological data in most cases of incisedwounds in the cord, and the absence of sharply circumscribed le-sions in the other cases that have come to autopsy have madephysiological study from this source difficult. Meyers* case isimportant in that the lesion (Myelitic destruction) was sharplydefined though of slow development. There was destruction ofthe entire cross-section from the 4th to 6th thoracic segment, withthe exception of the dorsal two-thirds of the posterior columns anda few pyramidal fibers which were intact. (Fig. I.) Tactile sen- SEXSORY FIBERS IN THE SPIXAL CORD 83 sibility is normal, also localization, the report says, but analgesiaand thermanesthesia were present below the 6th rib. It is to bere
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