J.Jpn. Surg. Soc.. 56(7): 884-892, 1955

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THE EFFECTS OF ABLATION OF THE CEREBRAL CORTEX FOR THE EPILEPTIC CONVULSION IN DOGS
1. THE EFFECTS OF ABLATION OF THE UNILATERAL CEREBRAL CORTEX

The cerebral cortex of dogs including the motor area in various extent have been removed. After the long- term observation of these dogs, the residual cerebral cortex is stimulated by the electric and chemical means. The resuits are as foIIows:
1. The convulsion can be produced by the stimulations in the wide area of cerebral cortex. But after ablation of the motor area, no convulsion occurs.
2. Four to eleven weeeks after the ablation of unilateral motor area, the convulsion can be produced by the stimulation of ipsilateral remaining cortex.
3. In this case, in addition to it, if the ipsilateral face area (Gyrus coronarious, compositus anterior, ectosylvius anterior) is removed, a convulsion does not occur by the stimulation of ipsilateral remaining cortex. But after eight weeks elapse, then the convulsion can be produced by the same stimulation.
4. Even if the unilateral cortical motor area and face area are removed, the convulsion still can be produced eight weeks thereafter.
5. If we remove all the cortical area from where the convulsion can be produced by the electric and chemical stimulations (Gyrus praecruciatus, sigmoideus, postcruciatus, suprasplenalis, entolateralis, ectolateralis, corocarius suprasylvius anterior et medius, sylviaticus, compositus anterior), then no convulsion occurs by stimulations of the remaining cortex.
(author's abstract)

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