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The prevalent idea that a lesion of one hemisphere produces a paralysis upon the opposite side of the body alone is no longer tenable, for each hemisphere is connected with both sides of the body by motor tracts, the larger of the motor tracts decussating and the smaller not decussating in the medulla. Hence a lesion of one hemisphere produces paralysis upon the opposite side of the body.
This reinforcement of the general language, by aids from the mintage of Shakspeare, had already commenced in the seventeenth century. In fact, by way of representing to himself the system or scheme of the English roads, the reader has only to imagine one great letter X, or a St. Andrew's cross, laid down from north to south, and decussating at Birmingham.
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