On the mammalian nervous system : its functions, and their localisation determined by an electrical method / by Francis Gotch and Victor Horsley.

  • Gotch, Francis, 1853-1913.
Date:
1891
Catalogue details

Licence: Public Domain Mark

Credit: On the mammalian nervous system : its functions, and their localisation determined by an electrical method / by Francis Gotch and Victor Horsley. Source: Wellcome Collection.

Provider: This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.

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    electrical effects evoked by its stimulation are due to the propagation of impulses alono' fibres which are confined to the column. This lesion was effected in three Cats on the left side, the results are seen in the following table :— Electrical Effect obtained in the Lumbar Cord by Excitation of Columns in the Dorsal Reo'ion after intervening: Section of Left Posterior Column. StimuluF, Left. Right. Cat (357) 2nd lumbar 10th dorsal Lat. Post. Lat. Post. 500 min. 68 12 82 48 „ min. 75 Lt 120 70 Cat (371) 1st lumbar 9tli dprsal 250 min. 86 0 89 34 500 min. 115 0 145 66 1000 max. 198 45 180 170 ,, max. 169 26 146 130 Cat (378) 500 min. 59 3 75 26 1000 max. lU 34 131 193 Average Effect obtained from Side of Section. Lateral Posterior . . . . Minimal stimulation. Maximal stimulation. 80 6 170 35 Average of Effect obtained from Side Opposite Section. Lateral Posterior .... Minimal stimulation. Maximal stimulation. 102 SI 1.52 164 It will be noticed that with minimal stimulation the interruption occasioned by the unilateral section Is almost complete ; hence we conclude that— (a.) Tlie stimulation must be localised to the column on which the electrodes are placed ; (b.) The electrical effect in the lumbar cord, following excitation of one posterior column, must be due to nerve impulses proceeding down channels confined to that column ;